pupil是可数名词。
pupil
n. 学生；瞳孔；未成年人
例句
Like teacher, like pupil.
有其师必有其徒。
The pupil buckled to the lesson.
这名小学生认真做功课。
The pupil lisped out the answer.
小学生口齿不清地说出答案。
An unusual pupil size or shape.
瞳孔有不正常尺寸或者形状。
The pupil echoed his teacher\'s words.
小学生重复老师的话。
