sea shells 海贝
egg shells 蛋壳
nut shells 果壳
bullet shells 弹壳
A: Did you find any interesting shells on the beach?
A：你在海滩上有发现什么有趣的贝壳吗？
B: Yes, I found some very large ones.
B：是的，我发现了一些非常大的。
1) 动植物的外壳
2) 炮弹或弹壳
3) 建筑物的残骸
1. 外壳，壳
2. 炮弹
noun
1. The hard outer covering of an animal, seed, or nut.
2. A projectile fired from a gun or artillery.
Synonym: casing, covering