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。
2
A mid-song sound that Dr Koren and Dr Geffen dubbed “chucks” communicates size (body length and head diameter) and also level of stress (as measured by cortisone levels).