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

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。

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Really, though, what makes the Kindle so successful isn’t what Amazon added to it; it’s what Amazon subtracted: size, weight and price.

那么，说到底，金读缘何如此成功并非亚马逊为它添加的卖点，而是亚马逊缩减的部分：尺寸、重量和价格。

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But Apple believes the lower size and weight, not the price, are the key attractions.

WSJ: Sizing Up the New iPad Mini

These advances have allowed shipbuilders to reduce the size and weight penalties associated with electric drives.

ECONOMIST: Electric ships

These planes use lithium-ion batteries because they are relatively powerful compared to their size and weight.

BBC: A model of the A350