Perforating

例句:

• It involved mechanical complications that seemed to be insurmountable, and up to the time Edison invented his perforating machine no really good method was available. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• In practice, there was employed such a number of perforating machines as the exigencies of business demanded. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• This was accomplished by making a chain of articulated cards, like a slatted belt, and perforating these cards with varying arrangements of holes. Edward W. Byrn. 十九世纪发明进展.

编辑:斯坦利