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

Lie on your back, feet flat on the floor, knees bent, hands at your sides.

整个背贴着躺在地上，脚板放平在地板上，两手放在身体两侧。

youdao

Lie on your back with your knees bent and feet flat on the floor.

背部着地，两膝弯曲，足平放于地面。

youdao

Lie flat on your back on a blanket, lawn chair or sleeping bag and look up, taking in as much of the sky as possible.

MSN: How to see the supermoon �� and shooting stars, too