第二线缆组件包括：第二小齿轮，其被安装来在所述外壳内做旋转运动；
A second cable assembly includes a second pinion gear mounted for rotational movement in the housing.
所述轨道组件包括一对可伸出的轨道、齿条、小齿轮以及限制单元。
The rail assembly includes a pair of extendable rails, a rack, pinions, and restricting units.
所述轨道组件包括一对可伸出的轨道、齿条、小齿轮以及限制单元。
The rail assembly includes a pair of extendable rails, a rack, pinions, and restricting units.
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