This thought experiment will help you understand quantum mechanics - Matteo Fadel

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2020-12-14 ใƒป TED-Ed


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This thought experiment will help you understand quantum mechanics - Matteo Fadel

307,469 views ใƒป 2020-12-14

TED-Ed


์•„๋ž˜ ์˜๋ฌธ์ž๋ง‰์„ ๋”๋ธ”ํด๋ฆญํ•˜์‹œ๋ฉด ์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค.

๋ฒˆ์—ญ: ๊ฒ€ํ† : DK Kim
00:07
After a long day working on the local particle accelerator,
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์ž…์ž ๊ฐ€์†๊ธฐ์—์„œ ์˜ค๋žซ๋™์•ˆ ์ผ์„ ํ•œ ํ›„์—
00:10
you and your friends head to the arcade to unwind.
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์—ฌ๋Ÿฌ๋ถ„๊ณผ ์นœ๊ตฌ๋“ค์€ ๊ธด์žฅ์„ ํ’€๋Ÿฌ ๊ฒŒ์ž„ ์„ผํ„ฐ์— ๊ฐ‘๋‹ˆ๋‹ค.
00:13
The lights go out for a second, and when they come back,
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๋ถˆ์ด ์ž ๊น ๋™์•ˆ ๋‚˜๊ฐ”๋‹ค๊ฐ€ ๋‹ค์‹œ ๋“ค์–ด์™”์„ ๋•Œ
00:16
there before you gleams a foosball table nobody remembers seeing before.
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์•„๋ฌด๋„ ๋ณธ ์  ์—†๋˜ ํ…Œ์ด๋ธ” ์ถ•๊ตฌํŒ์ด ์—ฌ๋Ÿฌ๋ถ„ ์•ž์— ๋†“์—ฌ ์žˆ์Šต๋‹ˆ๋‹ค.
00:22
Always game, you insert your coins.
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๊ฒŒ์ž„์€ ํ•ญ์ƒ ์žฌ๋ฏธ์žˆ์œผ๋‹ˆ ์—ฌ๋Ÿฌ๋ถ„์€ ๋™์ „์„ ๋„ฃ์Šต๋‹ˆ๋‹ค.
00:24
And with a fanfare, Quantum Foosball begins.
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ํŒกํŒŒ๋ฅด๊ฐ€ ์šธ๋ฆฌ๋ฉด์„œ ์–‘์ž ํ…Œ์ด๋ธ” ์ถ•๊ตฌ๊ฐ€ ์‹œ์ž‘๋ฉ๋‹ˆ๋‹ค.
00:28
Here are the rules: as with normal foosball,
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๊ทœ์น™์€ ์ด๋ ‡์Šต๋‹ˆ๋‹ค.
์ผ๋ฐ˜์ ์ธ ํ…Œ์ด๋ธ” ์ถ•๊ตฌ์™€ ๊ฐ™์ด ๋ชฉํ‘œ๋Š” ์ ์ˆ˜๋ฅผ ์–ป๋Š” ๊ฒ๋‹ˆ๋‹ค.
00:31
the object is to score points
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00:33
by spinning levers with tiny players to sink the ball in your opponentโ€™s goal.
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์ž‘์€ ์„ ์ˆ˜๋“ค์ด ๋‹ฌ๋ฆฐ ๋ง‰๋Œ€๋ฅผ ๋Œ๋ ค ์ƒ๋Œ€ํŽธ์˜ ๊ณจ๋Œ€๋กœ ๊ณต์„ ๋„ฃ๋Š” ๊ฑฐ์ฃ .
00:38
Only instead of a standard ball, youโ€™ll be playing with a giant electron.
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๋‹จ์ง€ ํ‰๋ฒ”ํ•œ ๊ณต ๋Œ€์‹ ์— ์ปค๋‹ค๋ž€ ์ „์ž๋กœ ๊ฒฝ๊ธฐ๋ฅผ ํ•ฉ๋‹ˆ๋‹ค.
00:42
It behaves like a normal electron in all respects, itโ€™s just much larger.
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๋ชจ๋“  ๋ฉด์—์„œ ํ‰๋ฒ”ํ•œ ์ „์ž์™€ ๋˜‘๊ฐ™์€๋ฐ ๋‹ค๋งŒ ํ›จ์”ฌ ํด ๋ฟ์ž…๋‹ˆ๋‹ค.
00:46
Though the rules are simple, gameplay is anything but.
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๊ทœ์น™์€ ๊ฐ„๋‹จํ•˜์ง€๋งŒ ๊ฒฝ๊ธฐ๋Š” ๊ฒฐ์ฝ” ๊ทธ๋ ‡์ง€ ์•Š์Šต๋‹ˆ๋‹ค.
์ต์ˆ™ํ•œ ๋‰ดํ„ด ๋ฌผ๋ฆฌ ๋ฒ•์น™ ๋Œ€์‹ ์—
00:51
Instead of the familiar laws of Newtonian physics,
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00:54
the movement of the ball is governed by quantum mechanics.
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์ „์ž ๊ณต์˜ ์›€์ง์ž„์€ ์–‘์ž ์—ญํ•™์— ์˜ํ•ด ์ขŒ์šฐ๋ฉ๋‹ˆ๋‹ค.
00:57
To minimize the influence from photons and air molecules,
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๊ด‘์ž์™€ ๊ณต๊ธฐ ๋ถ„์ž์˜ ์˜ํ–ฅ์„ ์ตœ์†Œํ™”ํ•˜๊ธฐ ์œ„ํ•ด์„œ
01:01
youโ€™ll be playing in a vacuum. In the dark.
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์ง„๊ณต ์ƒํƒœ์™€ ์–ด๋‘  ์†์—์„œ ๊ฒŒ์ž„์„ ํ•˜๊ฒŒ ๋  ๊ฒ๋‹ˆ๋‹ค.
01:04
But thatโ€™s ok, because you can watch for the flashes of light
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ํ•˜์ง€๋งŒ ๊ดœ์ฐฎ์Šต๋‹ˆ๋‹ค.
์„ ์ˆ˜ ๋ชจํ˜•๊ณผ ๊ณต ์‚ฌ์ด์˜ ์ถฉ๋Œ๋กœ ์ธํ•ด ๋ฐฉ์ถœ๋˜๋Š” ๋น›์„ ๋ณผ ์ˆ˜ ์žˆ๊ธฐ ๋•Œ๋ฌธ์ด์ฃ .
01:07
given off by collisions between figures and the ball.
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01:11
The goals themselves will flash when the electron
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์ „์ž๊ฐ€ ๊ณจ๋Œ€์˜ ์ž…์ž ํƒ์ง€๊ธฐ๋ฅผ ๊ฑด๋“œ๋ฆฌ๋ฉด ์Šค์Šค๋กœ ๋ฒˆ์ฉ์ž…๋‹ˆ๋‹ค.
01:14
hits their particle detectors.
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01:16
Now you just have to figure out how to get the electron to go where you want.
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์ด์ œ ์ „์ž๋ฅผ ์›ํ•˜๋Š” ๊ณณ์œผ๋กœ ๋ณด๋‚ด๋Š” ๋ฐฉ๋ฒ•์„ ์•Œ์•„๋‚ด์•ผ ํ•ฉ๋‹ˆ๋‹ค.
01:21
As soon as it enters play, the electron will never rest.
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์ผ๋‹จ ๊ฒŒ์ž„์„ ์‹œ์ž‘ํ•˜๋ฉด ์ „์ž๋Š” ์ ˆ๋Œ€ ๋ฉˆ์ถ”์ง€ ์•Š์Šต๋‹ˆ๋‹ค.
01:25
This is a direct consequence of the Heisenberg Uncertainty Principle,
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ํ•˜์ด์  ๋ฒ ๋ฅดํฌ ๋ถˆํ™•์ •์„ฑ ์›๋ฆฌ์˜ ์ง์ ‘์ ์ธ ๊ฒฐ๊ณผ์ž…๋‹ˆ๋‹ค.
01:29
which says that the better you know where a quantum particle is,
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์ฆ‰, ์–‘์ž ์ž…์ž๊ฐ€ ์–ด๋””์— ์žˆ๋Š”์ง€ ๋” ์ž˜ ์•Œ์ˆ˜๋ก
01:33
the less you know about its velocity, and vice versa.
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์ž…์ž์˜ ์†๋„๋Š” ๋” ๋ชจ๋ฅธ๋‹ค๋Š” ๋œป์ด๊ณ , ๋ฐ˜๋Œ€์˜ ๊ฒฝ์šฐ๋„ ๋งˆ์ฐฌ๊ฐ€์ง€์ž…๋‹ˆ๋‹ค.
01:37
Since you know itโ€™s on the field, its velocity is largely uncertain.
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์ „์ž ๊ณต์ด ์–ด๋””์— ์žˆ๋Š”์ง€ ์•„๋‹ˆ๊นŒ ์ž…์ž์˜ ์†๋„๋Š” ๋งค์šฐ ๋ถˆํ™•์‹คํ•ฉ๋‹ˆ๋‹ค.
01:42
The electron will behave more like a wave than a particle,
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์ „์ž๋Š” ์ž…์ž๋ณด๋‹ค๋Š” ํŒŒ๋™์ฒ˜๋Ÿผ ์›€์ง์ด๋Š”๋ฐ
01:45
with its position described by probability distributions that youโ€™ll have to imagine.
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์œ„์น˜๊ฐ€ ํ™•๋ฅ  ๋ถ„ํฌ์— ๋”ฐ๋ผ ํ‘œ์‹œ๋˜์–ด์„œ ์ƒ์ƒํ•ด์•ผ๋งŒ ํ•ฉ๋‹ˆ๋‹ค.
01:50
These distributions are spread throughout the entire field,
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์ด ๋ถ„ํฌ๋Š” ๊ฒฝ๊ธฐํŒ ์ „์ฒด์— ํผ์ ธ ์žˆ๊ณ 
01:54
making it possible to observe a goal at any time and in either side.
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์–ธ์ œ๋“ ์ง€ ์–ด๋Š ํŽธ์—์„œ๋‚˜ ๊ณจ์„ ๊ด€์ฐฐํ•  ์ˆ˜ ์žˆ๊ฒŒ ํ•ด์ค๋‹ˆ๋‹ค.
02:00
The way to win is to control and concentrate the distribution
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์ด๊ธฐ๋Š” ๋ฐฉ๋ฒ•์€ ๋ฐ˜๋Œ€ํŽธ ๊ณจ๋Œ€์— ๋ถ„ํฌ๋ฅผ ์กฐ์ ˆํ•˜๊ณ  ์ง‘์ค‘์‹œ์ผœ์„œ
02:04
over the opposite goal,
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02:06
giving yourself the highest likelihood of scoring points.
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์—ฌ๋Ÿฌ๋ถ„์ด ๋“์ ํ•  ์ˆ˜ ์žˆ๋Š” ๊ฐ€๋Šฅ์„ฑ์„ ์ตœ๋Œ€๋กœ ๋งŒ๋“œ๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค.
02:11
Your skill as a player will be determined by your ability to predict
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์„ ์ˆ˜๋กœ์„œ์˜ ๊ธฐ๋Ÿ‰์€
์ „์ž๊ฐ€ ๊ฐ€์žฅ ์žˆ์„ ๋ฒ•ํ•œ ๊ณณ์ด ์–ด๋””์ธ์ง€ ์˜ˆ์ธกํ•˜๋Š” ๋Šฅ๋ ฅ๊ณผ
02:15
where the electron is most likely to be,
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02:18
then manipulate the probability distribution by spinning the rods
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๊ทธ ๋‹ค์Œ์œผ๋กœ๋Š” ์ ์ ˆํ•œ ์–‘์˜ ํž˜์œผ๋กœ ๋ง‰๋Œ€๋ฅผ ๋Œ๋ ค ํ™•๋ฅ  ๋ถ„ํฌ๋ฅผ ์กฐ์ •ํ•˜๋Š”
02:22
with just the right amount of strength.
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๋Šฅ๋ ฅ์— ์˜ํ•ด ๊ฒฐ์ •๋ฉ๋‹ˆ๋‹ค.
02:25
Quantum particles only receive energy in precise amounts, called quanta.
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์–‘์ž ์ž…์ž๋“ค์€ ํ€€ํƒ€๋ผ๊ณ  ๋ถ€๋ฅด๋Š” ์ •ํ™•ํ•œ ์–‘์˜ ์—๋„ˆ์ง€๋งŒ ๋ฐ›์Šต๋‹ˆ๋‹ค.
02:30
So spin too hard or too soft,
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๋„ˆ๋ฌด ์„ธ๊ฒŒ ํ˜น์€ ๋„ˆ๋ฌด ์•ฝํ•˜๊ฒŒ ๋Œ๋ฆฌ๋ฉด
02:33
and the electron will stay on its previous course.
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์ „์ž๋Š” ์ด์ „ ๊ฒฝ๋กœ ๊ทธ๋Œ€๋กœ ์›€์ง์ž…๋‹ˆ๋‹ค.
02:36
The game board has been carefully constructed to contain the electron,
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๊ฒŒ์ž„ํŒ์€ ์ „์ž๋ฅผ ๋‹ด๊ณ  ์žˆ๋„๋ก ์„ธ์‹ฌํ•˜๊ฒŒ ๋งŒ๋“ค์–ด์กŒ์ง€๋งŒ
02:40
but even so, sometimes itโ€™ll quantum tunnel through the walls
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๊ทธ๋ž˜๋„ ๊ฐ€๋”์€ ๋šœ๋ ทํ•œ ์ด์œ  ์—†์ด ์–‘์ž ํ„ฐ๋„๋กœ ๋ฒฝ์„ ํ†ต๊ณผํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
02:44
without any apparent reason.
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02:46
At that point it could be anywhere in the universe,
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๋ฒฝ์„ ํ†ต๊ณผํ•ด ์‚ฌ๋ผ์ง€๋ฉด ์ „์ž๋Š” ์šฐ์ฃผ ์–ด๋””์—๋ผ๋„ ์žˆ์„ ์ˆ˜ ์žˆ์œผ๋ฏ€๋กœ
02:49
so to save you the trouble of tracking it down,
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์ „์ž๋ฅผ ์ฐพ๋Š” ์ˆ˜๊ณ ๋ฅผ ๋œ๊ธฐ ์œ„ํ•ด
02:51
the game will spit out a new ball.
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๊ฒŒ์ž„์—์„œ๋Š” ์ƒˆ๋กœ์šด ๊ณต์ด ๋‚˜์˜ต๋‹ˆ๋‹ค.
02:53
The fact that quantum particles behave like waves
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์–‘์ž ์ž…์ž๊ฐ€ ํŒŒ๋™์ฒ˜๋Ÿผ ์›€์ง์ธ๋‹ค๋Š” ์‚ฌ์‹ค์€
02:57
becomes particularly evident in the presence of obstacles.
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์žฅ์• ๋ฌผ์ด ์žˆ์œผ๋ฉด ๋” ๋ช…๋ฐฑํ•ด์ง‘๋‹ˆ๋‹ค.
03:01
As the particle travels through the rows of miniature figures,
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์ž…์ž๊ฐ€ ๋ชจํ˜•์ด ๋Š˜์–ด์„  ์ค„๋“ค์„ ํ†ต๊ณผํ•ด ์›€์ง์ผ ๋•Œ
03:04
complicated interference patterns will develop in the probability distribution,
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๋ณต์žกํ•œ ๊ฐ„์„ญ ์–‘์‹์ด ํ™•๋ฅ  ๋ถ„ํฌ์ƒ ๋‚˜ํƒ€๋‚˜๊ฒŒ ๋˜๋ฉด์„œ
03:09
making it even more difficult to accurately predict its position.
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์ „์ž์˜ ์œ„์น˜๋ฅผ ์ •ํ™•ํ•˜๊ฒŒ ์˜ˆ์ธกํ•˜๋Š” ๊ฒƒ์„ ๋”์šฑ ๋” ์–ด๋ ต๊ฒŒ ๋งŒ๋“ญ๋‹ˆ๋‹ค.
03:13
And hereโ€™s where your advanced physics degree can finally come in handy:
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์—ฌ๋Ÿฌ๋ถ„์˜ ๊ณ ๊ธ‰ ๋ฌผ๋ฆฌํ•™ ํ•™์œ„๊ฐ€ ๋“œ๋””์–ด ์“ธ๋ชจ๊ฐ€ ์ƒ๊ฒผ์Šต๋‹ˆ๋‹ค.
03:18
you can use the laws of quantum mechanics to your advantage.
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๋ฐ”๋กœ ์—ฌ๋Ÿฌ๋ถ„์ด ์œ ๋ฆฌํ•˜๋„๋ก ์–‘์ž ์—ญํ•™ ๋ฒ•์น™์„ ์‚ฌ์šฉํ•˜๋Š” ๊ฒ๋‹ˆ๋‹ค.
03:22
The only moments when the electron will behave as a particle,
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์ „์ž๊ฐ€ ํŒŒ๋™์ด ์•„๋‹ˆ๋ผ ์ž…์ž์ฒ˜๋Ÿผ ์›€์ง์ด๋Š” ์œ ์ผํ•œ ์ˆœ๊ฐ„์€
03:25
rather than a wave, are when it hits something.
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๋ฌด์–ธ๊ฐ€์— ๋ถ€๋”ชํž ๋•Œ์ž…๋‹ˆ๋‹ค.
03:28
With frequent enough kicks,
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์ž์ฃผ ์ถฉ๋ถ„ํžˆ ๋ถ€๋”ชํžˆ๊ฒŒ ๋˜๋ฉด
03:30
the particle would have no time to evolve like a wave and, therefore,
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์ž…์ž๋Š” ํŒŒ๋™์ฒ˜๋Ÿผ ๋ณ€ํ™”ํ•  ์‹œ๊ฐ„์ด ์—†์–ด์„œ
๊ณต๊ฐ„์— ํผ์ง€์ง€ ์•Š๊ฒŒ ๋ฉ๋‹ˆ๋‹ค.
03:34
not spread out in space.
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03:36
So if you can pass it very quickly between two of your miniatures,
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๋”ฐ๋ผ์„œ ๋ชจํ˜• ๋‘ ๊ฐœ ์‚ฌ์ด๋กœ ๋งค์šฐ ๋น ๋ฅด๊ฒŒ ์ „์ž๋ฅผ ํ†ต๊ณผ์‹œํ‚ค๋ฉด
03:40
you can keep it localized.
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๊ณ„์† ์œ„์น˜๋ฅผ ์•Œ์•„๋‚ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.
03:42
Masters of the game call this the Quantum Zeno Maneuver.
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์ด ๊ฒฝ๊ธฐ์˜ ๊ณ ์ˆ˜๋“ค์€ ์ด๊ฒƒ์„ ์–‘์ž ์ œ๋…ผ ์ž‘์ „์ด๋ผ ๋ถ€๋ฆ…๋‹ˆ๋‹ค.
03:47
Now, if you really want to dominate your opponents,
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์ƒ๋Œ€๋ฐฉ์„ ์••๋„์ ์œผ๋กœ ์ด๊ธฐ๊ณ  ์‹ถ๋‹ค๋ฉด
03:50
thereโ€™s one more thing you can try, but itโ€™s pretty tricky.
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ํ•  ์ˆ˜ ์žˆ๋Š” ๊ฒƒ์ด ํ•˜๋‚˜ ๋” ์žˆ์ง€๋งŒ, ๊ฝค ๊นŒ๋‹ค๋กญ์Šต๋‹ˆ๋‹ค.
03:53
One of the distinctive features of the quantum world
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์–‘์ž ์„ธ๊ณ„์˜ ๋…ํŠนํ•œ ์„ฑ์งˆ ์ค‘ ํ•˜๋‚˜๋Š”
03:56
is the possibility of state superpositions,
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๋ฐ”๋กœ ์ƒํƒœ ์ค‘์ฒฉ ๊ฐ€๋Šฅ์„ฑ์ž…๋‹ˆ๋‹ค.
04:00
where particlesโ€™ positions or velocities
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์ฆ‰, ์ž…์ž๋“ค์˜ ์œ„์น˜๋‚˜ ์†๋„๊ฐ€
04:02
can be simultaneously in two or more different states.
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๋™์‹œ์— ๋‘˜ ํ˜น์€ ๊ทธ ์ด์ƒ์˜ ๋‹ค๋ฅธ ์ƒํƒœ์— ์ฒ˜ํ•  ์ˆ˜ ์žˆ๋‹ค๋Š” ๊ฒ๋‹ˆ๋‹ค.
04:07
If you can put the electron into a superposition
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๋งŒ์•ฝ ์ „์ž๋ฅผ ์ค‘์ฒฉ ์ƒํƒœ์— ๋‘”๋‹ค๋ฉด
04:10
of being simultaneously kicked and not kicked,
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์ฆ‰ ๋ถ€๋”ชํžˆ๋ฉด์„œ ๋™์‹œ์— ๋ถ€๋”ชํžˆ์ง€ ์•Š๋Š” ์ƒํƒœ์— ์ฒ˜ํ•˜๊ฒŒ ํ•œ๋‹ค๋ฉด
04:14
itโ€™ll be almost impossible for your opponents to figure out
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์ƒ๋Œ€๋ฐฉ์ด ์–ด๋””๋กœ ์–ด๋–ป๊ฒŒ ์ณ๋‚ด์•ผ ํ•˜๋Š”์ง€ ์•Œ์•„๋‚ด๋Š” ๊ฒƒ์ด ๊ฑฐ์˜ ๋ถˆ๊ฐ€๋Šฅํ•ด์ง‘๋‹ˆ๋‹ค.
04:17
where and how to strike.
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์—๋ฅด๋นˆ ์Šˆ๋ขฐ๋”ฉ๊ฑฐ๋Š”
04:20
Itโ€™s said that Erwin Schrรถdinger,
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์—ญ๋Œ€ ๊ฐ€์žฅ ๋›ฐ์–ด๋‚œ ์–‘์ž ํ…Œ์ด๋ธ” ์ถ•๊ตฌ ์ฑ”ํ”ผ์–ธ์ด์—ˆ๋Š”๋ฐ
04:22
the greatest Quantum Foosball champion of all time,
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04:25
is the only player to have mastered this technique.
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์ด ๊ธฐ์ˆ ์„ ์ˆ™๋‹ฌํ•œ ์œ ์ผํ•œ ์„ ์ˆ˜๋ผ๊ณ  ํ•ฉ๋‹ˆ๋‹ค.
04:28
But maybe you can be the second:
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์–ด์ฉŒ๋ฉด ์—ฌ๋Ÿฌ๋ถ„์ด ๋‘ ๋ฒˆ์งธ ์„ ์ˆ˜๊ฐ€ ๋  ์ˆ˜ ์žˆ์„์ง€๋„ ๋ชจ๋ฆ…๋‹ˆ๋‹ค.
04:31
Just figure out a way to simultaneously turn and not turn your rods.
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๋ง‰๋Œ€๋ฅผ ๋Œ๋ฆฌ๋ฉด์„œ ๋™์‹œ์— ๋Œ๋ฆฌ์ง€ ์•Š๋Š” ๋ฐฉ๋ฒ•๋งŒ ์ฐพ์•„๋ณด์„ธ์š”.
์ด ์›น์‚ฌ์ดํŠธ ์ •๋ณด

์ด ์‚ฌ์ดํŠธ๋Š” ์˜์–ด ํ•™์Šต์— ์œ ์šฉํ•œ YouTube ๋™์˜์ƒ์„ ์†Œ๊ฐœํ•ฉ๋‹ˆ๋‹ค. ์ „ ์„ธ๊ณ„ ์ตœ๊ณ ์˜ ์„ ์ƒ๋‹˜๋“ค์ด ๊ฐ€๋ฅด์น˜๋Š” ์˜์–ด ์ˆ˜์—…์„ ๋ณด๊ฒŒ ๋  ๊ฒƒ์ž…๋‹ˆ๋‹ค. ๊ฐ ๋™์˜์ƒ ํŽ˜์ด์ง€์— ํ‘œ์‹œ๋˜๋Š” ์˜์–ด ์ž๋ง‰์„ ๋”๋ธ” ํด๋ฆญํ•˜๋ฉด ๊ทธ๊ณณ์—์„œ ๋™์˜์ƒ์ด ์žฌ์ƒ๋ฉ๋‹ˆ๋‹ค. ๋น„๋””์˜ค ์žฌ์ƒ์— ๋งž์ถฐ ์ž๋ง‰์ด ์Šคํฌ๋กค๋ฉ๋‹ˆ๋‹ค. ์˜๊ฒฌ์ด๋‚˜ ์š”์ฒญ์ด ์žˆ๋Š” ๊ฒฝ์šฐ ์ด ๋ฌธ์˜ ์–‘์‹์„ ์‚ฌ์šฉํ•˜์—ฌ ๋ฌธ์˜ํ•˜์‹ญ์‹œ์˜ค.

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