Besides efficiency, durability and reliability, the most important requirement for solar cells was how much power they could generate per unit of weight.
它在除了功效、耐久性和可靠度之外，最重要的要求是电池每重量单元能产生多少功率。
The high metabolic rate of small animals, for example, gives them sustained power and activity per unit of weight, but at the cost of requiring constant consumption of food and water.
例如，小动物较高的新陈代谢率，以其体重的每单位计算均能赋予动物以持续不断的能量和活动能力，但其代价是，要求它们不间断地消耗水和食物。
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