It is the presence of this gas that necessitates the safety-lamp. 佚名.神奇的知识之书.
We have seen how one discovery, or the development of a certain art, brings in its train and often necessitates other inventions and discoveries. 威廉·亨利·杜利特.世纪发明.
As one invention necessitates and begets others, so special forms of machines for sawing and working up wood into pegs were devised. 威廉·亨利·杜利特.世纪发明.
It is the law of inventions that one invention necessitates and generates another. 威廉·亨利·杜利特.世纪发明.
If your disapproval of it should render you unwilling to discharge such business as it necessitates, I am sorry for it, and must seek other aid. 查尔斯·狄更斯.小杜丽.
The production of several completed plays per week necessitates the employment of a considerable staff of people of miscellaneous trades and abilities. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.