kill two birds with one stone是什麼意思？

kill two birds with one stone意思是：一石二鳥

例句

By carpooling, we can save money on gas and reduce traffic congestion, so we'll be killing two birds with one stone.
通過拼車, 我們可以節省汽油費用, 並減少交通擁堵, 因此我們將一石二鳥.

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