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We use this expression to warn someone not to do too much of something.
我们用这个表达来警示某人不要过量做某事。
A: What are your plans for the holidays?
你假期有什么计划?
B: I think I'm going to go to the gym every day to lose a bit of weight.
我准备天天都去健身房减肥。
A: Don't overdo it - be careful.
别太过了，小心一点。