初级通道网和各种尺寸的次级通道网相联接，次级通道分送空气到各个房间的出风口。
This network of primary channels is connected to a series of secondary channels of various sizes which distribute air to the outlets located in the rooms.
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.
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