Specifies the vertical scrolling increment for a form's vertical scroll bar.

指定窗体垂直滚动条的滚动增量.

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Horizontal scrolling should be avoided. Vertical scrolling should be avoided if possible.

避免使用水平滚动条,尽可能避免使用垂直滚动条.

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To rapidly scan information on the screen of a visual display unit by vertical scrolling.

通过纵向向上卷动以快速扫描显示屏幕上的信息.

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