他们开始了解肥料堆积和生物多样性。

They begin to learn about the compost heap, and about biodiversity.

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珊瑚由数百万微小生物的遗骸组成，经过数百万年的堆积，每一百万年就形成了一座岛屿。

Coral was made up of the bodies of millions of tiny creatures, piled up over millions of years -a million years for each island.

youdao

那些污泥坑中被称之为有孔虫的微小生物以及一些植物等其他物质不断堆积，形成了对海平面上升情况的自然记录。

That steady accumulation of muck traps tiny organisms called foraminifera, plant matter and other substances that form a natural record of sea level rise.

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