anti-torque tail rotor 抗扭螺旋桨
torque tail rotor
扭矩尾桨
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
youdao
The rotors turn in opposite directions to cancel out torque, the twisting action which requires conventional helicopters to use a tail rotor a hazardous appendage.
ECONOMIST: Autonomous helicopters
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