For preference the chair should be pneumatically adjustable so that you can adjust seat pan height while you are sitting on the chair.

• 对于偏好主持会议应气动可调，使您可以调节座椅高度潘当你坐在主持会议。Some chairs have a mechanical height adjustment (spinning) mechanism that is also acceptable.；有椅子有机械高度调整（纺纱）的机制，这也是可以接受的。