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Between the last layer of Cretaceous rock and the first layer of Cenozoic rock, there is often a thin layer of clay.

在最后一层白垩纪岩石和第一层新生代岩石之间，常常有一层薄薄的粘土。

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Drop several seeds over the surface of the pot and cover with a thin layer of vermiculite, a substance that can hold air, water and nutrients.

VOA: special.2009.04.21

A thin layer of water runs over this surface.

VOA: special.2009.05.06

The cells can then be separated from debris and a thin layer deposited on a glass slide.

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Such a thin layer alters the current flow in a way that reduces the current's susceptibility to magnetic interference.

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For instance, electroplating can be used to coat a thin layer of gold on to a cheap piece of material.

ECONOMIST: MONITOR