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微不足道 -------- not worth mentioning
例句：
A: I don't know how to thank you. I am really very grateftal to you for stopping to help me.
真不知道该怎么感谢你。谢谢你停下来帮我。
B: Oh, that's all right. It is not worth mentioning actually.
啊，没什么。真的微不足道。
痛定思痛 ---------- draw a lesson from a bitter experience
例句：
A: I am disappointed in a love affair. Rose likes someone else.
我失恋了，罗丝爱上了别人。
B: Yon need draw a lesson from a bitter experience.
你需要痛定思痛。
痛改前非 ------------- thoroughly rectify his errors
例句：
A: Carl swore he would thoroughly rectify his errors.
卡尔发誓他要痛改前非。
B: Really? That's the way it should be.
真的吗？应该这样。
例句：
A: I don't know how to thank you. I am really very grateftal to you for stopping to help me.
真不知道该怎么感谢你。谢谢你停下来帮我。
B: Oh, that's all right. It is not worth mentioning actually.
啊，没什么。真的微不足道。
痛定思痛 ---------- draw a lesson from a bitter experience
例句：
A: I am disappointed in a love affair. Rose likes someone else.
我失恋了，罗丝爱上了别人。
B: Yon need draw a lesson from a bitter experience.
你需要痛定思痛。
痛改前非 ------------- thoroughly rectify his errors
例句：
A: Carl swore he would thoroughly rectify his errors.
卡尔发誓他要痛改前非。
B: Really? That's the way it should be.
真的吗？应该这样。
