贝壳硬朊

例句：

1. 1. The shell of the clam is made up of a hard exoskeleton.
   蛤蜊的壳由坚硬的外骨骼组成。
2. 2. The shell protein in the shell provides protection for the organism.
   壳中的蛋白质为生物体提供了保护。
3. 3. The shell protein can be used to make artificial bones and implants.
   壳蛋白可用于制造人工骨骼和植入物。