"a number of" 后面通常接复数名词。例如:
- A number of students are studying in the library.
- A number of books were donated to the school.
然而,需要注意的是,虽然 "a number of" 后面接复数名词,但 "the number of" 后面则应该接复数名词且相关的动词应使用单数形式。例如:
- The number of participants in the competition is increasing.
这样的用法是为了强调数量的概念。希望这能帮到你!