The three force system of the spine and fixed to play the role of traction, so that the spine flexible and flexibility, so that people can do the normal cervical curve, thoracic curve, lumbar curve.

这三个力系对脊椎起到牵引和固定的作用，使脊柱具有弹性和柔韧性，使人们可以做到正常的颈弯，胸弯，腰弯。

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The output axle of the driving motor is connected with the input axle of the torque sensor through a first normal coupling and a first flexible coupling connected in series.

驱动电机的输出轴通过相互串接的第一普通联轴器和第一柔性联轴器同扭矩传感器的输入轴连接。

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Mental health has such features as normal intelligence, good self-awareness, good mood, morality and flexible adaption.

心理健康的特征应是：智力正常、自我意识好、心境好、交往好、人品好、适应能力强等等。

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Under normal circumstances (meaning reasonably flexible markets and reasonably high employment), employers gauge how much they are willing to pay someone to do a particular job.

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