kill two birds with one stone是什么意思？

kill two birds with one stone意思是：一石二鸟

例句

By carpooling, we can save money on gas and reduce traffic congestion, so we'll be killing two birds with one stone.
通过拼车, 我们可以节省汽油费用, 并减少交通拥堵, 因此我们将一石二鸟.

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