a number of：許多的；
例句：
There were a number of errors and omissions in the article.
這篇文章中有多處錯誤和疏漏。
A number of people have been employed to deal with the backlog of work.
已雇來一些人處理積壓的工作。
They were planning to solicit funds from a number of organizations.
他們正計劃向一些機構募集資金。
This model comes with a number of optional extras.
這一型號有一系列可供選擇的附件，價格另計。