这个想法是球充当了“反桨”的角色，强迫你用你的前臂而不是你的手来抓抱水。游任何泳姿、训练、甚至划水时都可以用这种方法。
The idea here is that the ball acts as an "anti-paddle" forcing you to use your forearms instead of your hands to hold onto water.
这个想法是球充当了“反桨”的角色，强迫你用你的前臂而不是你的手来抓抱水。
The idea here is that the ball ACTS as an "anti-paddle" forcing you to use your forearms instead of your hands to hold onto water.
试验结果表明，桨、舵球间距的变化对螺旋桨敞水效率的影响是明显的。
The test results indicated that the variation of the spacing between propeller and rudder bulb has obvious effect on propeller open water efficiency.
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