... keep relax and normal保持自然和放松 keep back straight (spine)保持背部挺直 open your shoulder打开你的肩膀 ...
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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.
保持背部挺直,向上推你的手臂直到手臂伸直。
Keeping your back straight, push up with your arms until your arms are extended.
保持背部挺直,可以预防伤害。
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