压力和力气不一样，压力是指单位面积内所承受的力。
Pressure is different from force — pressure takes into account the area over which a force is exerted.
电流密度：单位电镀面积下所承受的电流，通常电流密度越高膜厚越厚，但是过高时镀层会烧焦粗燥。
Current density: unit under the plating area under current, usually the higher current density film thickness is thicker, but is high coating will scorched thick dry.
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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