1. The scroll boxes inside the scroll bar indicate your vertical and horizontal location in the document. 滚动条内的滚动块指示出你在文件中的垂直和水平位置。
2. Use to add a horizontal or vertical scroll bar with adjustable scroll button to an interface. 用于将带有可调滚动按钮的水平或垂直滚动条添加到界面上。
3. Drag onto the page to add a vertical scroll bar with adjustable scroll button to an interface. 拖到绘图页后，可以将带有可调滚动按钮的垂直滚动条添加到界面上。
4. Click to scroll down one object in the object list. To quickly scroll through the list, hold down your mouse pointer over the button . 单击该按钮可以向下移动对象列表中的一个对象。要快速移动对象列表，请在该按钮上按住鼠标指针。
5. The middle button of a mouse device. On many mice with a scroll wheel, the scroll wheel can be pushed down for a middle mouse button click. 25鼠标中间的按键。许多鼠标上有一个滚轮，按下这个滚轮就相当于点击中键。
