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。
Finally, some research direction of plasma drag reduction technology in China are suggested.
最后针对我国的减阻研究情况，提出了等离子体减阻技术的研究方向。
Finally, some research direction of plasma drag reduction technology in China are suggested.
最后针对我国的减阻研究情况，提出了等离子体减阻技术的研究方向。
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