noun, place word · the natural outer covering of an egg, nut, or certain animals

蛋壳碎了一地。

noun · the protective case or housing for a machine, device, or electronic component

这台电脑的金属壳看起来很高级。

noun · the hard outer covering of an animal or object, typically used in formal or technical compounds

地壳是地球最外层的固体部分。