She injured her spine in a fall and a doctor told her to lie flat on her back for a month so it can mend.

她摔伤了脊椎，医生让她平躺一个月以便恢复。

youdao

For variation, the woman can even lie completely flat, face down on the bed with her legs open, as her partner lies on top of her back, entering from behind.

如果要有所变化，女性可以完全平躺着，面部朝下，双脚打开，由趴在她背部的伴侣从后面进入。

youdao

For variation, the woman can even lie completely flat, face down on the bed with her legs open, as her partner lies on top of her back, entering from behind.

如果要有所变化，女性可以完全平躺着，面部朝下，双脚打开，由趴在她背部的伴侣从后面进入。

youdao