The nonsmooth morphology of primaries is propitious to reducing the air vortex resistance which is caused by flapping volitation.
鸽初级飞羽的非光滑形态，有利于减少振翅飞翔中产生的空气漩涡的阻力。
The nonsmooth morphology of primaries is propitious to reducing the air vortex resistance which is caused by flapping volitation.
鸽初级飞羽的非光滑形态，有利于减少振翅飞翔中产生的空气漩涡的阻力。
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