JScrollPane组件甚至随预注册的侦听器一起提供，所以当这个组件获得焦点且用户移动鼠标滚轮时窗格将会滚动。

The JScrollPane component even comes with a pre-registered listener, so the pane will scroll when it has focus and the user moves the wheel.

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砂轮主轴与电机一体，采用预加载荷的高精度滚动轴承。

Wheel spindle and motor is either designed to use preload super precision ball bearing in a case.

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主要分析差动滑动和弹性滞后等因素对承受预加载荷下的滚动直线导轨副摩擦力的影响，得出了过盈量与摩擦力的关系。

The effect of differential sliding and elastic hysteresis on the frictional force in the rolling linear guide (LG) subjected to preloading is analyzed.

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