短语词组短语power back -off 功率回退Power Shut -off 电源关断;完全电源关断;到完全电源关断Power on -off 即电源开关power turn -off 断电power cut -off 结束工作;同上;结束工作熄火rotor power take -off 转子动力输出power take -off drive 动力输出传动装置rear power take -off 后方动力输出 返回 power-off