Water is part of a large cycle: it travels over land via rivers and lakes and through the oceans before evaporating \ into \ the atmosphere and eventually returning to the surface by precipitation.
水是一个大循环的一部分：水蒸发到空气中，最终又通过雨雪等降水方式回到地表，在进入这个循环之前，水通过河湖流过陆地，进入海洋。
Since the header on the evaporating heating surface adopts pre-separation structure, the effectiveness and speed of water-steam separation in the drum are improved.
同时，锅炉的蒸发受热面上集箱采用预分离结构，提高了汽包的分离效果和分离速度。
The water fell there as rain, and we know that rain is made by the sun's heat evaporating the water on the earth's surface.
水作为雨下来，我们知道，雨是由于太阳的热量使地球表面水分蒸发而形成的。
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