Instead, birds have a complex network of air sacs that work like bellows to pump a constant stream of air through the lungs.
相反地，鸟类有一个复杂的肺泡结构，就像一个风箱把源源不断的空气打进肺里。
The type of the pump impeller and pump and centrifugal pump with a volume effect of particles suspended in mid-stream leaf out of date, do not hit any part of the pump, it is good non-destructive.
该型叶轮的泵兼具有容积泵和离心泵的作用，悬浮性颗粒在叶片中流过时，不撞击泵内任何部位，故无损性好。
A new hydraulic design method and the numerical method of axial flow pump impeller are introduced. The integral equation for flow calculation of S1 stream surface of impeller is derived.
介绍了一种新的轴流泵叶轮的水力设计方法，推导了求解叶轮s 1流面流动的积分方程。
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