In 1882, however, a machine for doing this was invented, thereby dispensing with the old hand method and cheapening the operation. Edward W. Byrn.十九世纪发明进展.
Late improvements in the manufacture of inks are due to the discovery and cheapening of substances which can be used in preparing them. 威廉K.戴维.智者、化学家和伟大医生的秘密.
Another was a cheapening of school-books. 赫伯特·乔治·威尔斯.世界史纲.
One of the incidents which caused a very great cheapening was that, when we started, one of the important processes had to be done by experts. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
For cheapening the cost of buttonholes, and reducing the hand labor, various buttonhole machines and attachments to sewing machines have been devised. Edward W. Byrn.十九世纪发明进展.
A friend of mine was the other day cheapening some trifles at a shopkeeper's, and after a few words they agreed on a price. 本杰明·富兰克林.富兰克林自传.