But chitin deposits never build up on the sea or forest floor.

但是，甲壳素沉积从来没有积累成海洋或森林有机质层。

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And the sulphide mineral deposits lie directly on the sea floor.

而硫化物矿藏直接坐落在海床上。

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And the sulphide mineral deposits lie directly on the sea floor.

而硫化物矿藏直接坐落在海床上。

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