The virtio_driver structure defines the upper-level device driver, list of device IDs that the driver supports, a features table (dependent upon the devicetype), and a list of callback functions.
virtio_driver 结构定义上层设备驱动程序、驱动程序支持的设备 ID 的列表、一个特性表单（取决于设备类型）和一个回调函数列表。
2
The improved device consists of J2135 collision experiment device, drawing table and soleplate, and also adds a mobile board and a L-type positioning device.
改进的装置由J2135型碰撞实验器、绘图板和底板组成，并增加了活动托板和“L”型定位器等装置。
3
The incline-type paper-moving table top, together with the reduction gear and the positioning device, allows for more smoothness of sheet paper.