前臂、后臂、辅臂以及插件与主杆之间为活动连接， 均可折叠于主杆上。
The front arm, the rear arm, the auxiliary arm and the plug-in are movably connected with the main rod and can be folded on the main rod.
前臂、后臂、辅臂以及插件与主杆之间为活动连接， 均可折叠于主杆上。
The front arm, the rear arm, the auxiliary arm and the plug-in are movably connected with the main rod and can be folded on the main rod.
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