鸟类以皮下脂肪沉积或“身体储备”的形式储存能量；通过测量体重的变化，可以可靠地估计这些储备的变化。

Birds store energy as subcutaneous fat deposits or "body reserves"; changes in these reserves can be reliably estimated by measuring changes in body mass.

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没有任何证据支持既测量上臂中部臂围又测量体重身高Z分数。

There was no evidence to support measuring both MUAC and weight-for-height z-score.

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据经济学家介绍，体重指数(测量体重与身高比例的指标)上升10%，男性的实际收入就会下降3.3%，女性则会下降1.8%。

Just a 10 percent increase in body mass index, a measure of weight relative to height, can cut a man's real earnings by 3.3 percent and a woman's by 1.8 percent, according to economists.

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