Our temperature probably fluctuates during the day a little bit anyways, it's not very accurate. And similarly, the boiling point, defining that at a 100 degrees Celsius well that depends on the pressure.
这就不太精确,我们的体温一天之中,会有高低的变化,这一定义不够精确,类似的,我们把水的沸点定义为。
One problem that people have is understanding what a portion is, because you say we should have this many servings of fruits and vegetables a day, we should have this many servings of that a day.
人类很难理解每餐食物摄入量这概念,因为假设,我们一天应该摄入一定份量的水果和蔬菜,各种食物每天都有一定摄入量
Nuclear power, for example, may be our salvation when we run out of oil--or virtually run out of oil-- it seems to be coming up over the next several decades-- we're going to have to do that, we're going to need nuclear power.
比如说核能,在石油资源枯竭,或快要枯竭的时候,也许再过几十年,这一天就会来临,核能可能成为我们的救世主,那时我们就需要核能源了
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