尽管可以定义背景颜色、字体颜色和空白边，但是我们保持打印设备的默认设置。

While we could have defined the background color, font color, and margins, we left this to the default Settings of the printing device.

youdao

在默认情况下，在白色背景上生成图形；这对于可能要打印的图形是有意义的。

By default, the graph generated will be on a white background; this makes sense, as the graph would probably be printed.

youdao

这样，我们只有当页面是在屏幕上显示时使用低分辨率的背景图像和并在打印时隐藏它(根据ForPrint参数值进行判断)。

This way we show the low resolution background image of this page during screen viewing and hide it during printing (based on the value of ForPrint parameter).

youdao