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。
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。
I could only lie flat on my back with a pillow under my knees.
我只能平躺，并且要垫一个枕头在膝盖后面。
Lie on back, knees bent, feet flat on floor.
仰卧，膝关节弯曲，脚底平贴地面。
Lie on back, knees bent, feet flat on floor.
仰卧，膝关节弯曲，脚底平贴地面。
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