B2 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层;涂层
More examples
Cover the meat with a layer of cheese.
Women have a layer of subcutaneous fat that provides them with better insulation than men.
The eruption had covered the town with a fine layer of ash.
A thick layer of dust had accumulated in the room.
If the first layer isn't dry before you add the next one, the colours will run into each other .
the group of people at a particular level in an organization(机构)层次
to arrange something in layers把…按层排列,把…分层放置
to cut hair so that some top parts of the hair are shorter than the hair underneath, to give it a particular style or shape把(头发)剪成不同层次
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