He once invented a machine which could cut up paper quickly
问题描述：
He once invented a machine which could cut up paper quickly
翻译
答
他曾经发明过一个机器,可以很快把纸切碎.
He once invented a machine which could cut up paper quickly
翻译
他曾经发明过一个机器,可以很快把纸切碎.