One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.
提高高旁通飞机引擎的方法之一就是把风扇变成开放式旋翼，有点回归于螺旋桨的味道，但要使用两圈粗短的反旋桨叶。
Scroll machine which possess characteristics of high efficiency, small bulk, light weight, low noise, simple structure and working smoothly etc, is used in supercharged vehicle engine.
涡旋机械由于其结构简单、效率高、体积小、噪声低、运转平稳等特点被应用于车用增压器技术中。
The efficiency of steering pump of port tractor lost very heavy when engine was in high speed.
港口牵引车液压系统中的转向泵在发动机高速状态时的能量损失较大。
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