他们希望减少建筑工作所需的部件数量和重量，例如，用空心管代替实心支架。

They hope to reduce both the number of components needed in a construction job and their weight—by replacing solid supports with hollow tubes, for example.

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然而，随着时间的推移，世界的产出已经变成了价值与其大小和重量无关的商品。

Over time, however, world output has shitted into goods whose worth is unrelated to their size and weight.

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由于庞大的体积和重量，现在的农业机械有显著的缺点：它们会把土壤压实，降低土壤孔隙度，杀死有益的生命，这意味着农作物不会长得太好。

With their enormous size and weight, today's farm machines have significant downsides: they compact the soil, reducing porosity and killing beneficial life, meaning crops don't grow so well.

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Fat has twice the calories per unit weight that protein or carbohydrate sugar has, as a consequence, has the greatest survival value.

单位重量中脂肪的热量含量,是蛋白质和碳水化合物的两倍,因此,脂肪才是最能维持生存的物质

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

And if you want to lose body fat as far as that kind of weight, that's the way to do it.

如果你想要减掉脂肪和重量，这就是方法。

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As I mentioned before, fat has twice the calories per unit weight as protein and carbohydrate.

如我之前所说,单位重量中脂肪的热量含量,是蛋白质和碳水化合物的两倍

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选