01
draw the line
底线
It means establishing a figurative boundary that someone or some group refuses to cross or beyond which no further advance or compromise is accepted.它的意思是建立一个比喻性的边界，如果超过这个界限，便不再让步或妥协。
例句
Where do you draw the line between genius and madness?
天才和疯狂之间如何划界呢？
You have to know what's what and when to draw the line
你必须搞清状况以及自己的底线。
美剧《生活大爆炸》中，Leonard和Penny对话时，就出现了这个表达：
Penny: I got asked to sign autographs there. But I'm not doing it.
Leonard: Why not?Penny: You just said yourself, it's sad.
Leonard: Yeah, but it's not pathetic. That's where I draw the line.
-我被邀请去办签名会，但我不打算去了。
-为啥不去？-你刚才自己也说了，很惨啊。
-但没有到可悲啊，我的底线就是不可悲则可行。
02
have one's limits
底线
Definition: To have a set of ideas about what is reasonable to do, and to not accept behavior that does not follow those ideas. 某人有他的底线；某人有他的原则；某人的容忍也是有限度的
例句
I am willing to try a lot of new things but I have my limits and will not do anything illegal.
我很乐意去尝试不同的新事物，可是我有我的底线，犯法的事情我是不会做的。
Even saints, it seems, have their limits.
看来，就算是圣人也是有他们的底线的。
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