首先 不能用an 打错了是吧?
其次 疑点在与前面的are 与 后面的a
在这个句子中,teachers 和students 是作为一类事物而言 可以用the teacher 和the student 代替
both 后面单数复数都可以 所以可以是a dispensable part 也可以是dispensable parts
不过别忘了 both的反义词neither 后只能用单数
both teachers and students are an dispensable part
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