But the catch is that the party on the other end of things has to have that same machine or know that same number.

但是那个隐情是对立面的党派,必须有一个同样的机器或者知道那个密钥。

哈佛公开课 - 计算机科学课程节选

I'm really tired and I have a lot of school work to catch up on.

我真是累坏了，我还有许多落下的功课得补起来。

I'd like 实战 - SpeakingMax英语口语达人

So come on up and I'll--okay, But you have to be comfortable on stage, that's the catch 'cause this will be going out on the Internet.

请你们上来，好的，但是，在台上你们必须放松，这是重点，因为这视频会放到网上。

哈佛公开课 - 计算机科学课程节选

And if the other countries aren't going to cut down on their fishing, then you want to catch the fish now, because there aren't going to be any there tomorrow.

如果其他国家不打算减少捕捞量,那么你现在就想先把鱼都捞起来,因为没准明天就会无鱼可捞了

耶鲁公开课 - 博弈论课程节选

I can change everything overnight; it does happen. I put that in for a reason because sometimes some of you have not taken a physics course and you don't know how to do well in physics and slowly you catch on and by the time it's Final exam you crack the code; you know how to do well.

我能一夜之间扭转乾坤,确实有过这样的例子,我这样做是因为,有时你们中有人可能以前没上过物理课,不知道怎样学好物理,但慢慢地你赶了上来,到期末考试的时候,你忽然灵光一闪,考起试来得心应手

耶鲁公开课 - 基础物理课程节选