trachystomata的翻译，读音
释义：
硬口目
n. pl. An order of tailed aquatic amphibians, including
Siren and Pseudobranchus. They have anterior legs only, are eel-like in
form, and have no teeth except a small patch on the palate. The
external gills are persistent through life.
n. pl. An order of tailed aquatic amphibians, including
Siren and Pseudobranchus. They have anterior legs only, are eel-like in
form, and have no teeth except a small patch on the palate. The
external gills are persistent through life.