egg shell

例句：

1. 1. The chicken lays an egg every day.
   鸡每天下蛋。
2. 2. The egg is a symbol of fertility and new life.
   鸡蛋是生育和新生的象征。
3. 3. The eggshell is made up of calcium carbonate.
   蛋壳由碳酸钙组成。