What you'll find is a variation in design and usage of the available kernel APIs, but each is useful for instruction or as a starting point for a new device driver.
在这里可以找到的是各种设计的变化以及对可用内核api的使用，但是所学到的每一点都会非常有用，都可以作为新设备驱动程序的起点。
The sharp variation of luminance at the entrance and exit of highway tunnel will cause the difficulty in visual adaptation of the driver, and even lead to traffic accidents.
公路隧道进出口亮度的急剧变化会造成驾驶员视觉适应困难，严重时甚至导致交通事故。
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