一旦转子安装，他们会通过减少材料，创建了一个通道，降低了螺旋桨的顶部和管壁之间的间隙。
Once the rotors are fitted, they'll cut through the material, creating a channel that reduces the clearance between the propeller top and duct wall.
一旦转子安装，他们会通过减少材料，创建了一个通道，降低了螺旋桨的顶部和管壁之间的间隙。
Once the rotors are fitted, they'll cut through the material, creating a channel that reduces the clearance between the propeller top and duct wall.
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