■ staff 与 stuff

两者要注意区别。前者是“人员”的总称，是集合名词，但是也可以用来代替可数名词的复数。

• A total of 20 senior staff of The University of Hong Kong who have served the University for over 25 years will receive long service awards in a ceremony on Friday, April 28, 2006. (University of Hong Kong, Press Releases, April 26, 2006)香港大学有二十名在该大学工作二十五年以上的人员，将于 2006 年 4 月 28 日星期五的一个仪式上领得长期服务奖。

stuff 则是“材料”、“东西”、“物料”的总称，是不可数名词。

• approve
• approve of
• approve 与 approve of
• a quick study
• archive
• arise
• arise, rise 与 arouse
• arm
• arms
• around
• arouse
• arrival
• art
• as
• as
• as
• as against
• as a matter of fact
• as...any
• as... any, as... ever
• as...ever
• as good as
• ash
• aside
• as it is