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We use this expression to tell someone that we are happy to take responsibility for doing something.
我们用这个短语来告诉某人我们很乐意负责某事。
A: How can we get hold of a video recorder before the meeting tomorrow?
我们怎样才能在明天开会前弄到一台录像机呢?
B: Leave it to me. I know someone who can help.
交给我吧。我知道有人能帮忙。