The most obvious example is the fraenum which attaches the tongue to the bottom of the mouth, or the lip to the gum.

最为显著的例子即连接舌头和口底、唇和牙龈的舌系带。

youdao

The most obvious example is the fraenum which attaches the tongue to the bottom of the mouth, or the lip to the gum.

最为显著的例子即连接舌头和口底、唇和牙龈的舌系带。

youdao