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We use this expression to decline an offer someone has made, or to give a negative opinion of something we don't want to or wouldn't want to do.
我们用这个表达来拒绝别人的提议，或者对我们不想做或不想做的事情给出否定的意见。
A:We're going to the cinema. Do you want to come with us?
我们要去看电影。你想和我们一起去吗
B: Thanks but no thanks. I've got something planned.
你的好意我心领了，但是我有别的安排了。