It lifts to its upper position as soon as there is gas flow.
它升降机其上的立场，尽快有气流。
It is crucial that the upper back and neck are held in an erect position to give support for the head.
重要的是：上背和颈部要挺直以支撑头部，这一点很重要。
Engage your core muscles, then curl your upper body towards a sitting position.
调动人体核心部位的肌肉力量向上抬体，成坐姿。
Engage your core muscles, then curl your upper body towards a sitting position.
调动人体核心部位的肌肉力量向上抬体，成坐姿。
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