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DEFINITIVE EXAMPLES 权威例句〔DIRECTION〕Tornadoes usually form when rising warm, moist air rotates, as winds from opposite directions collide. 两股相对的气流相撞，上升的暖湿气流发生旋转，通常就会形成龙卷风。朗文写作活用〔moist〕Fog is formed when warm moist air moves over a cold surface.当暖湿空气遇冷时就形成了雾。韦氏高阶〔rather〕Millions of years ago, Idaho was not dry. Rather, it was warm and damp.在几百万年以前, 爱达荷州并不干燥。相反, 那时这里非常温暖湿润。外研社新世纪 |