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I kept saying to myself that when at last they found out about him, it will be like the sun falling out of the sky.
VOA: special.2010.03.27
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Virgil alludes to just this passage in Homer when he describes the entrance of a whole crowd of people in to the underworld as "the falling of leaves in the early frost of autumn."
维吉尔只是在荷马中影射了这点,他描述了通往人群拥挤的地狱的入口,如同“在深秋严寒中无情飘落的叶子“
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When you're falling to the surface of the Earth, you are describing a problem of constant acceleration.
当你讨论下落问题时,你在描述一个加速度恒定的问题
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"I kept saying to myself that when at last they find out about him, it will be like the sun falling out of the sky.
VOA: special.2009.01.03
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You start off with a transition period when you're falling asleep. We call that stage I.
一开始是过渡期,你开始进入睡眠状态，这是第一阶段。
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The World Health Organization has warned people with breathing problems to remain indoors as much as possible when the ash is falling.
VOA: standard.2010.04.17
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When the stock market is going up they think that -they increasingly think that the stock market is just the best investment, until when it starts falling, then they start retracting from that.
当股票市场上行时,越来越多的人会觉得,股票是最佳投资选择,而当股市下跌时,人们纷纷从股市中撤出
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So，the point is,every object falling under gravity is given by the same formula, but there are many, many objects that can have many histories, all falling under gravity, and what's different from one object and the other object is, when was it dropped, from what height, and with what initial speed.
关键是,每一个受重力作用下落的物体,都有同样的表达式,但是各个受重力作用下落的物体,都有不同的初始条件,所以它们的区别在于,下落时刻,下落高度和初始速度
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Conversely, if you get an answer and it doesn't seem to make sense, then you've got to go back and ask, am I violating some of the assumptions, and here you will find the assumption that the particle had that acceleration a is true as long it's freely falling under gravity but not when you hit the ground.
反过来说,如果你得到一个结果,发现似乎是错的,那么你就应该回过头来问问自己,我是不是违反某些前提了,这个模型中,你就发现,只要质点在重力作用下自由下落,质点具有加速度a的前提是正确的,但是落地后就不成立了
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