为了减少建筑的整体重量，它在楼层中使用了较少的混凝土；这反过来又减少了对结构钢的使用。
To reduce the overall weight of the building, it used less concrete in the floors; that in turn enabled it to cut down on structural steel.
它必须体现这座建筑的整体重量。
因为用碳纤维代替钢铁制造汽车将大大减轻车身的整体重量。
Replacing the steel in a car with carbon fiber would shave hundreds of pounds off its weight.
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