layer
/leɪər/
single thickness of usually some homogeneous substance
中文释义：层；层次
The cake consists of three layers of sponge and cream.
这个蛋糕由三层海绵蛋糕和奶油组成。
A protective layer of ozone shields the Earth from harmful radiation.
一层保护性的臭氧层保护地球免受有害辐射。
/leɪər/
single thickness of usually some homogeneous substance
中文释义：层；层次
The cake consists of three layers of sponge and cream.
这个蛋糕由三层海绵蛋糕和奶油组成。
A protective layer of ozone shields the Earth from harmful radiation.
一层保护性的臭氧层保护地球免受有害辐射。