layer

柯林斯词典

1. N-COUNT A layer of a material or substance is a quantity or piece of it that covers a surface or that is between two other things. 层
...the depletion of the ozone layer. …臭氧层的损耗。
2. N-COUNT If something such as a system or an idea has many layers, it has many different levels or parts. 层次
Critics and the public puzzle out the layers of meaning in his photos. 评论家和公众苦思冥想出了他照片中的层层含意。
3. V-T If you layer something, you arrange it in layers. 分层放置
Layer half the onion slices on top of the potatoes. 把一半洋葱片一层层地放在土豆上。

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 .