... main rotor head 主旋翼桨毂 Main Rotor Head Set 强化型的主旋翼头组 helicopter rotor head 直升机旋翼桨毂 ...
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In a helicopter the articulated head and tail rotor gearbox are required to be a very high specification design using the best materials and requiring frequent and costly maintenance.
在直升机的阐述头和尾桨变速箱都必须是一个非常高规格的设计使用最好的材料和需要频繁和昂贵的维修。
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