The width of the vertical scroll bar and the height of the horizontal scroll bar are constant for a particular video driver and display resolution.
垂直滚动条的宽度和水平滚动条的高度对于特殊的视频驱动程序和显示分辨率来说是常量。
Generally, the crane driver depend on the experience and sight to set the height of the hook, which have some disadvantages of low precision and waste the human resource.
通常情况下，天车司机是凭借着经验和肉眼观察来确定吊钩高度的，这样做的缺点是精度低，且造成了人力资源浪费。
The hot-air balloon doesn't depend on power, but float by means of wind. Because the wind direction and speed vary with the height, the driver can choose the proper height as the flight required.
但是，由于风在不同的高度有不同的方向和速度，驾驶员可以根据飞行需要的方向选择适当的高度。
The hot-air balloon doesn't depend on power, but float by means of wind. Because the wind direction and speed vary with the height, the driver can choose the proper height as the flight required.
但是，由于风在不同的高度有不同的方向和速度，驾驶员可以根据飞行需要的方向选择适当的高度。
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