sheathed at base
底部有护套
以上为机器翻译结果，长、整句建议使用 人工翻译 。
An outer sleeve is sheathed at the outside of the gear seat which rotates on the base to drive the outer sleeve and a dish-shaped antenna to rotate.
该齿轮座外套设外套管，该齿轮座在座体上旋转带动该外套管和碟形天线旋转。
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