N-COUNT. (用来保护或隐藏的)覆盖物，遮盖物. A covering is a layer of something that protects or hides something else. N-COUNT. 三明治;夹心面包片. A sandwich usually consists of two slices of bread with a layer of food such as cheese or meat between them.
A white layer of ashes covered the fire.
一层白色的灰烬盖在那堆火上。
A fine layer of dust covers everything.
所有的东西都盖了一层薄薄的灰尘。
※Life is like an onion: You peel it off one layer at a time,and sometimes you weep. 生活就象洋葱头:你只能一层一层地把它剥开,有时你还得流泪.
