地球上目前已发现的矿物超过4000种，然而地球形成之初的矿物种类却寥寥无几。
Today more than 4,000 different minerals can be found on Earth. When the planet began to be formed, however, few existed.
地球上目前已发现的矿物超过4000种，然而地球形成之初的矿物种类却寥寥无几。
Today more than 4, 000 different minerals can be found on Earth. When the planet began to be formed, however, few existed.
不过一些新研究表明，水可能在地球诞生之初就已经存在。
A new theory suggests that water was already present at the birth of our planet.
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