科学家曾打算找到治愈天花的方法，但他们收效甚微。
Scientists had intended to finds a cure for smallpox, but they got nowhere.
尽管篮球明星姚明等名人都呼吁停止捕杀鲨鱼，但他们的行动收效甚微。
Pleas by celebrities likebasketball star Yao Ming to stop the killing of sharks have done little toquell the feeding frenzy.
尽管篮球明星姚明等名人都呼吁停止捕杀鲨鱼，但他们的行动收效甚微。
Pleas by celebrities likebasketball star Yao Ming to stop the killing of sharks have done little toquell the feeding frenzy.
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