From what I remember, water changes back and forth from water in lakes and oceans to vapor, and then back to water again when it falls as rain or snow, as precipitation.

根据我的记忆，水往复地变化，从湖泊和海洋里的水变成水蒸气，然后当它以雨或雪——也就是降水的形式落下时又变成水。

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When the radiant energy of the sun falls on the earth, it is changed into heat energy, and as a result the earth is warmed.

当太阳的辐射能落在地球上时， 就变为热能，于是， 地球暖和起来了。

《新英汉大辞典》

So it is both alarming and surprising when life expectancy falls, even for a small part of the population.

所以，当预期寿命下降时就要警醒注意了，即便只是少数人。

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And when it falls back down that energy is given off.

当它回去的时候,它的能量也消耗殆尽了。

麻省理工公开课 - 固态化学导论课程节选

So, that's a funny property of conventional mortgages -that the mortgage balance declines very slowly at first and then it falls rapidly when it comes to maturity.

这是普通贷款很有意思的特性,即贷款余额在起初减少的非常缓慢,但随着到期日的临近,便会加速递减

耶鲁公开课 - 金融市场课程节选

Now this is a rain gauge, and it's sitting on a roof of a building, and when the water falls into this gauge, it sends a signal to the logic unit of the computer, which immediately notifies the memory bank of the computer to seek out its instructions for a rainy day.

这是一个雨量测量器，安装在一个楼房的,屋顶上，当水流入到这个测量器，它就给计算机的逻辑部件发送一个信号，计算机立即通知内存条,为下雨天找出相应的指令。

哈佛公开课 - 计算机科学课程节选

Just like the tides along any seashore, this market will again recede, and when it falls, like today, be ready with your wish list of great buys (more later).

FORBES: When The Market Tumbles, Buy These Stocks

Snow-pack and glaciers provide a buffer between when the precipitation falls as snow and when it is released as water.

UNESCO: 83e

Management typically gets too much credit when a stock has risen to extremes and too much blame when it falls.

FORBES: Apple's Shares Probably Saw Their Bottom