"So it's been thought that sleep must serve some as-yet unidentified physiological or neural function that can't be accomplished when animals are awake," he said.

“所以人们一直认为睡眠一定具有某种还未被辨知的生理或神经上的功用，而且在醒着的时候无法完成之，”他说。

youdao

A student who studies too hard for exams may not eat, sleep or play, for so long that he becomes a basket case and must be sent to the hospital.

为了考试而用功过度的学生，也可能不吃、不睡、不玩，时间久了，成了无力自理的人，只好被送进医院。

youdao