contra-rotating propellers 对转桨 ; 同轴反转螺旋桨叶
contra-rotating rotors 双旋翼纵列式结构
contra-rotating axial-flow fan 对旋轴流通风机 ; 对旋式轴流通风机
contra-rotating screws 对转螺旋桨
coaxial contra-rotating propellers 同轴反转螺旋桨 ; 同轴对转螺旋桨
contra-rotating axial flow fan 对旋式轴流风机
coaxial contra-rotating reduction gear 同轴对转减速齿轮
以上来源于: WordNet
So, how studies can accurately prediction to the contra-rotating propeller hydrodynamic performance is more important.
所以，研究如何更能准确地预报对转螺旋桨水动力性能更为重要。
The X2 uses a pusher propeller mounted at the rear and has a pair of contra-rotating main rotors, one positioned above the other.
它使用一个安装在后面的推进式螺旋桨并有一对一上一下反向旋转的主旋翼。
By means of numerical simulation, the research on inner-flow of mining contra-rotating axial flow fan working under low flow rate condition was made.
通过数值模拟手段，对一矿用对旋式轴流式通风机小流量工况内部流动进行了深入研究。
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