The flow of air over the surface of the ball was turbulent, which gave the ball a relatively low amount of drag.
球的表面流动的空气形成湍流，这使得球的阻力相对较低。
With no air flow, current should be low.
如果没有空气流动，电流应该比较低。
This article introduces an air bubble method for low speed flow visualization in water tunnel.
本文介绍一种用于低速流动显示的空气泡方法。
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