The hard shell on a beetle is an outside protection, as is the "skin", called cuticle, of an earthworm.
甲壳虫身上的硬壳是外表保护层，就像蚯蚓的“皮肤”，它叫角质层。
2
When genetic characterization of the contents of beetle guts gave some unexpected results, the researchers decided to take a closer look at earthworm DNA.
当甲虫内脏内容物的遗传特性显示出一些意想不到的结果时，研究人员决定进一步研究蚯蚓的 DNA 。
3
The anatomy of an earthworm is much simpler than that of a man.