shell gland

例句：

1. 1. The scientist discovered the new species by examining its shell gland.
   科学家通过检查其外壳腺体发现了新物种。
2. 2.The researchers found that the shell gland plays a crucial role in the animal's defense mechanism.
   研究人员发现，壳腺在动物的防御机制中起着至关重要的作用。
3. 3. The shell gland is responsible for producing the hard outer layer of the shell.
   壳腺负责产生贝壳的硬外层。