石油是一种化石燃料。

Petroleum is a fossil fuel.

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研究人员还发现了另外两个已命名的鳄种的新化石。

In addition the researchers found new fossils of two previously named species.

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这已被看作是一种可能性，为蛋成为化石。

This has been seen as a possibility for the eggs to become fossilized .

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这已被看作是一种可能性，为蛋成为化石。

This has been seen as a possibility for the eggs to become fossilized .

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