对今天的大多数地质学家来说，韦格纳的《大陆和海洋的起源》是一份令人印象深刻的有先见之明的文件。
To most geologists today, Wegener's The origin of Continents and Oceans appears an impressive and prescient document.
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。
So scientists speculated that our planet's surface water came from comets that slammed into Earth once the planet had cooled.
虽然地球上的岩石或多或少都含有一定量的水，但是科学家认为这些水不足以形成今天的海洋，因此他们将目光转向太空，去寻找海洋的起源。
Our planet has always harbored water. The rubble that coalesced to form Earth contained trace amounts—tens to hundreds of parts per million—of the stuff.
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