使用绞盘前请仔细确认当前绞盘的工作任务是克服载荷还是滚动载荷。
This requires greater pulling capacity since the winch will have to overcome the friction of the surface as well as the load it self.
滚动载荷则需要较小的拉力，并且在拉动以后可以凭借物体滚动惯性而得以移动。
Rolling loads, however, require less mechanical effort to move the load once the initial inertia has been overcome.
为了增加接触面积并承受较大载荷，滚珠在内外环的曲线槽内滚动。
To increase the contact area and permit larger loads to be carried, the balls run in curvilinear grooves in the rings.
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