半圆形滚圈能够相对所述半圆形 轨道转动,从而使得操作台能够相对底座部分转动某一适当角度。
The pedestal includes one footing, one support on the footing, one semicircular track on the support and rollers in the track;
半圆形滚圈能够相对所述半圆形 轨道转动,从而使得操作台能够相对底座部分转动某一适当角度。
The pedestal includes one footing, one support on the footing, one semicircular track on the support and rollers in the track;
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