The drag force acts in the opposite direction to the path of the ball.
阻力方向与球的运行方向相反。
Drag onto the page. Drag round rotation handle to change arrow direction; yellow diamond to resize line ends.
拖到绘图页上。拖动圆形旋转手柄可更改箭头方向；拖动黄色菱形可调整线端的大小。
Automotive frontal area is projected area of automobile driving direction, which is necessary parameter of measuring automotive air drag coefficient.
汽车迎风面积是指汽车在行驶方向的投影面积，汽车迎风面积是求汽车空气阻力系数的必需参数。
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