Hayley教口语，“层”用英语怎么说？

layer

a level of material, such as a type of rock or gas, that is different from the material above or below it, or a thin sheet of a substance

某种物质，比如岩石或气体，与它上面或下面的物质不同，或一种物质的薄片;层;涂层

the ozone layer 臭氧层

A thick layer of clay 一层厚厚的黏土

a thin layer of oil 一层薄薄的油膜

several layers of 好几层

There was a thin layer of oil on the surface of the water.

水面上有一层薄薄的油膜。

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