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, feet flat on the floor, knees bent, hands at your sides.
对于仰泳，将手放前面并没有效果。
For backstroke, holding the arm out front doesn't really work.
化验员：两手放成这样，双肩前展，下巴搁在这儿。
Technician: Put your hands like this and your shoulders forward, rest your chin here.
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