all of us in physics find fascinating.

物理学界公认的有趣的内容
Some may or may not be useful,

有些可能有用有些可能没用
but you just don't know.

但你们现在还不知道
Some of you are probably going to be doctors

你们中的有些人可能会成为医生
and you don't know

但你们现在不能理解
why I'm going to do special relativity or quantum mechanics,

我为什么要讲相对论和量子力学
but you don't know when it will come in handy.

但是说不定什么时候你就用上了呢
If you're a doctor

如果你是个医生
and you've got a patient who's running away from you at the speed of light,

你的一个病人以光速逃跑了
you'll know what to do.

你就知道该怎么办了
Or, if you're a pediatrician

或者你是个儿科医生
with a really small patient who will not sit still,

而你的小病人却总也坐不住