前口 meaning in Chinese

fore-edge
maeguchi

The zk320 automatic bookcover gate - folding machine is designed mainle for the following functions : to trim the edge of the covered books according to the book size , to score and fole the bookcover so as to complete the edge folding process
Zk320自动书籍勒口机的主要功能是将上封装订后的书本按尺寸裁切前口、封面压痕、折页，从而完成书封前口的折页工序。