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。
Of all the extinctions now taking place, perhaps the most dramatic is that of coral reefs, the rain forests of the oceans and a foundation of many Marine ecosystems.
在所有正在濒临灭绝的物种中，反应最为剧烈的应该是珊瑚礁吧。珊瑚礁是海洋的热带雨林，是许多海洋生态系统的基础。
Carbon dioxide is continually entering the air as a result of burning and breathing, but it is also continually leaving the air by uniting with the rain, the oceans, rocks.
二氧化碳由于燃烧和呼吸连续不断地进入空气中，但它通过与雨水、海洋、岩石和土壤结合又不断地离开空气。
The rain then falls back into the oceans, lakes, rivers and plants, and it starts all over again.
然后，雨水回到海洋，湖泊，河流和植物中，整个循环又重新开始。
The rain then falls back into the oceans, lakes, rivers and plants, and it starts all over again.
然后，雨水回到海洋，湖泊，河流和植物中，整个循环又重新开始。
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