It is a medical observation that sleeping on the back is the distinctive feature of sick people.

这是一个医学的观测结果：仰卧是病人的一个区别性特征。

youdao

It is a medical observation that sleeping on the back is the distinctive feature of sick people.

这是一个医学的观测结果：仰卧是病人的一个区别性特征。

youdao