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bearingless | main rotor
 main rotor
avia. 主旋翼; 主转翼
compr. 主转子; 单螺杆转子
mech.eng. 主旋翼
tech. 主旋翼

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bearingless main rotor
: 4 phrases in 4 subjects
Aviation1
Electric machinery1
Mechanics1
Wind Energy1