战争期间这所学校被用作医院。
The school was used as a hospital for the duration of the war.
核武器应该只被用作最后手段。
释放战俘被用作讨价还价的筹码。
And so, by and large, until this freon was invented by Midgley, there wasn't a good gas that had the right properties to be used for a refrigerant.
因此,总的说来,直到Midgley发明氟利昂,没有一个气体,能被很好的用作制冷剂。
应用推荐