球的表面流动的空气形成湍流，这使得球的阻力相对较低。
The flow of air over the surface of the ball was turbulent, which gave the ball a relatively low amount of drag.
对带有自由表面流动问题的常用研究方法进行了总结。
The recent research on solving the problem of free surface has been summarized.
观察并探讨了不同工作介质沿模型铲刀表面流动和粘附的情况。
Medium particle flow along blade surface and adhesion to it were observed.
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