Let me give you a piece of advice.

我得提醒你一句。

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今天的几个句子是有关提醒的：1.You should be careful! 你得多加小心！2.It's not as easy as it sounds. 并不像听起来的那么容易。3.Think twice before you do it. 三思而后行。4.Let's not jump the gun. 别操之过急。5.You have an attitude problem. 你的态度太恶劣了。