Later,the production of this line of cells by companies would grow into an industry worth millions of dollars.

VOA: special.2010.07.21

They would have appeared in the seventeenth century with line numbers because line numbers obviously facilitate the production of scholarly commentary and facilitate the study of those texts in the classroom.

它们与行数都出现在十七世纪,因为显然便于,学者写评论,还便于课堂上学习那些诗歌。

耶鲁公开课 - 弥尔顿课程节选