你也可以认为空气压力就是在一定空间体积内的空气总量。
You can also think of air pressure as the amount of air in a certain volume of space.
环境保护主义者关于人口问题的归责长期唇枪舌剑争论不休：人口总量即与之对应的供给人口需要的水、食物、矿产和清洁的空气总量等等。
Environmentalists are arguing in circles about who or what is to blame: the total number of people; or the amount of water, food, mineral ores or clean air each demands.
科学家对植物和树木储存的能量非常感兴趣，首先是因为它们的总量比汽车、卡车、火车和飞机消耗的还多，其次是因为能源来自空气中的碳。
Scientists are tantalized by plants and trees because they store far more energy than is consumed by cars, trucks, trains and planes, and they do it by taking carbon out of the atmosphere.
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