n. the outer layer of the Earth
n. a hard outer layer that covers something
n. the trait of being rude and impertinent; inclined to take liberties
v. form a crust or form into a crust
n. 外壳, 坚硬外皮, 面包皮
vt. 盖以硬皮
vi. 结硬皮
1. The pizza has a thick crust that makes it very filling.
这块披萨有厚厚的饼皮，吃起来很饱。
2. The earth's crust is made up of rocks and minerals.
地球的地壳由岩石和矿物组成。
3. She likes to eat the crust of the bread, while her brother prefers the soft middle.
她喜欢吃面包的外皮，而她的哥哥更喜欢柔软的中间部分。