Yabla video uses of

直接 zhíjiē
暴露 bàolù
在外 zàiwài
de
皮肤 pífū
zhōng
yǒu
不少 bùshǎo
特殊 tèshū
de
粘液 niányè
xiàn
and on the exposed part of the skin are a lot of special mucous glands.
末端 mòduān
tóng
体内 tǐnèi
de
xiǎo
xiàn
内脏 nèizàng
器官 qìguān
相连 xiānglián
They are related to the main and internal organs of the body.