outer layer
US /ˈaʊtər ˈleɪər/
UK /ˈaʊtə ˈleɪə/
名词
外层, 外部覆盖物
the outermost part or covering of something
示例:
•
The planet's outer layer is composed mainly of rock.
行星的外层主要由岩石组成。
•
Peel off the outer layer of the onion before chopping.
切洋葱前，剥掉外层。