双脚分开与肩同宽，双臂抱着婴儿。保持背部挺直，重复深膝弯曲。
Standing with feet shoulder-width apart and cradle baby with both arms. Keeping a straight back and repeat deep knee bends.
罗纳德医生：……你要双膝弯曲。
背部着地，两膝弯曲，足平放于地面。
Lie on your back with your knees bent and feet flat on the floor.
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