Before it cooled, there was a so-called magma ocean on the Moon's surface - molten rocks, capable of retaining high quantities of water.
在月球冷却之前，它的表面有一个所谓的岩浆海洋-熔融岩，有保持大量水的能力。
So scientists speculated that our planet's surface water came from comets that slammed into Earth once the planet had cooled.
星球形成模型表明，由于地球早期非常热，所以地球表面不能保持住液态水分子，这使得地球海洋的起源成了谜团。
The oldest known rocks are about 4 billion years old, yet even they formed roughly half a million millenniums after our planet's surface cooled and water first pooled into shallow seas.
所知道的最古老的岩石出现在大约40亿年之前，而那也仍然是在地球表面冷却和水开始汇聚到浅滩之后大约5亿年才形成。
What is even more important is that as the earth cooled down, water began to appear on its surface.
更重要的是当地球冷却后，水就开始出现在它的表面。
When a lake cools, the cooled water at the surface flows to the bottom because of its greater density.
当湖泊降温时，湖面的冷水，由于密度较大而流向湖底。
As the earth cooled down, water began to appear on its surface.
随着地球的冷却，地球的表面开始出现了水。
Researchers said the zircon's high level of heavy oxygen isotopes suggest it was cooled by surface water after it formed.
研究人员说锆石的高标准重氧同位素暗示了它形成之后靠地表水来冷却。
The spray-cooled mold is a new type of mold for continuous casting, The cast strandis cooled by water sprayed into the surface of copper plate with a special designed nozzle in the newmold.
喷淋结晶器是一种新型的结晶器，它是用特殊的喷嘴将水喷淋到结晶器的铜板表面上进行铸坯冷却的。
In no measure has been taken to stop the moisture from the beneath when constructing, the cooled water beneath the surface will make the coating peel.
如果在没有对地下透上的湿气采取措施的情况下施工，涂层底表面的冷凝水会使涂层产生剥离。
What is even more important is that as the earth cooled down, water began to appear on its surface.
更为重要的是：当地球冷却下来后，水开始在地球表面出现了。
What is even more important is that as the earth cooled down, water began to appear on its surface.
更为重要的是：当地球冷却下来后，水开始在地球表面出现了。
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