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风扇安装定额已包含风扇调速开关安装。

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古代把大木称为，齐人缓言之则曰“钟葵”。

For Snyder, “civilization is separated from nature... our body is a vertebrate mammal being.”

From the fluidity of time and space, we get to know that Willy Loman used to be a successful ______ when he was young.

从历史上看，战争或者存在战争的威胁对飞机技术的发展有促进作用。