Because of the symmetry of the flow field of hovering rotor, one blade is needed to be calculated.
悬停旋翼的流场由于具有对称性，只需要对一片桨叶进行计算。
It spends its time hovering about upside down. The rotating blade is its foot.
它不停地上上下下，旋转着的像叶片一样的是它的足。
It spends its time hovering about upside down. The rotating blade is its foot.
它不停地上上下下，旋转着的像叶片一样的是它的足。
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