construction and maintenance enormously
Helicopters require a tail rotor to counteract the rotor torque; this and the articulated head complicate flying, construction and maintenance enormously.
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construction and maintenance enormously
建设和维护
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Helicopters require a tail rotor to counteract the rotor torque; this and the articulated head complicate flying, construction and maintenance enormously.
需要直升机尾桨抵消转子力矩；这和阐述头复杂飞行，建造和维修极大。
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