经济学人下载:特朗普拒不承认败选,美国危矣(3)

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In the short term, chemical sprays are clearly an effective way to control pests

从短期来看，喷洒化学药品显然能有效控制虫害。

2. lost cause 没有希望的事情

They do not want to expend energy in what, to them, is a lost cause.

他们不想把精力投到他们认为注定不会成功的事中去。