后面一个单词是是ability，意思是能力、才能，例如：
1、What criteria are used for assessing a student's ability?用什么标准来评定一个学生的能力
2、His outstanding ability earned him a place on the team.他非凡的能力为他在队中赢得了一席之地。
3、The system has the ability to run more than one program at the same time.该系统能够同时运行一个以上的程序。
