这些旧果酱瓶子应当留一留,说不定什么时候会用得著。
You should keep those old jam jars you never know when you might need them.
说不定我们什么时候还会再见面的。
说不定这个人会把脑袋伸出来,说点什么呢!
S'pose this one here was to stick his skull out and say something!
Some of you are probably going to be doctors and you don't know why I'm going to do special relativity or quantum mechanics, but you don't know when it will come in handy.
你们中的有些人可能会成为医生,但你们现在不能理解,我为什么要讲相对论和量子力学,但是说不定什么时候,你就用上了呢
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