中央部份可氖三维运动，让用者在不使用气压弹簧的情况下作无阻力横向屈曲。
With 3-dimension motion of the mid-body you can achieve frictionless lateral flexion with no movement in the gas springs.
中央部份可氖三维运动，让用者在不使用气压弹簧的情况下作无阻力横向屈曲。
With 3-dimension motion of the mid-body you can achieve frictionless lateral flexion with no movement in the gas springs.
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