开始于脊柱中立位并保持好姿势。
Begin in neutral spine and maintain position.
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保持头部在中立位置,并稍微抬起你的下巴。
Keep your head in a neutral position with your chin slightly raised.
保持颈部处于中立位。
Keep your neck neutral.
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模块上移
模块下移
不移动