单词：chaetognatha
<拉>毛颚动物
n. pl. An order of free-swimming marine worms, of which
the genus Sagitta is the type. They have groups of curved spines on
each side of the head.
the genus Sagitta is the type. They have groups of curved spines on
each side of the head.
词型变化：名词复数形式 : chaetognathas