the ball rolls up the hill on the other side, it can't go any higher than the height from

當球滾上另一側，它不能高​​於

which you dropped it - that's conservation of energy!

你把球丟下的高度，這就是能量的儲存

Even if there's a nice big long slope to roll down on the far side of the mountain, the

即使有一個漂亮的大長坡在山的另一側

ball just can't get there - unless you give it enough energy to get over the barrier.

球就是無法到達那裡 除非你給它足夠的能量來克服的障礙

But in quantum mechanics, things work a little differently.

但在量子力學中運作方式會有一點點不同。 你看，在量子世界

You see, the quantum world is probabilistic, so if you release a particle in a valley,

是隨機的， 所以如果你往山谷丟下一個粒子，有機率

chances are the next time you see it, it'll still be somewhere in that valley.

下一次看到它，它仍然會在山谷裡的某處 但是，如果是在漂亮的大斜坡滾下來

But if there's a nice big slope to roll down on the far side of the mountain… well, that's

在山的另一邊......好吧，這是那個粒子真正想去的地方

a place the particle would really like to be - and it turns out there's also a small

結果原來也有一小點的機會，你會那裡發現它！

chance that's where you'll find it!

如果這還不夠瘋狂 你甚至有可能會在山的中間發現這個粒子

If this isn't crazy enough, it's even possible you'll find the particle in the middle of

而在現實生活中意味著電子偶爾也會在

the mountain… and in real life this means that an electron sometimes hangs around inside

原子的原子核中間閒晃！

the nucleus of an atom!