Although face masks, which have become a common sight in Mexico City, are worn by only a few people on the streets of Juarez,pharmacies say they are doing a brisk business selling them.

VOA: standard.2009.04.30

It has a fairly large number of characters, although only a relatively few number of them speak in the book.

有很多角色，但仅其中相对少数,在书中发言。

耶鲁公开课 - 政治哲学导论课程节选

They can reproduce and so you only need to give a few of them in order to make many, many inside the body.

它们能自我复制,所以只需少量病毒,就能在体内产生大量的病毒

耶鲁公开课 - 生物医学工程探索课程节选