嘴唇紧而平，不松散。

Lips close and even, no looseness.

youdao

剪口特性：套管截面用剪刀剪断后。剪口平整、不松散。

Cutting feature: when the sleeving crosscut the cross end without loose and remain smooth.

youdao

剪口特性：套管截面用剪刀剪断后。剪口平整、不松散。

Cutting feature: when the sleeving crosscut the cross end without loose and remain smooth.

youdao