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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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