同义词
1)north arrow,指北针2)astronomy north-pointing,天文指北3)north seeking end(of magnetic needle),指北端4)lily,指北花纹5)north seeking pole,指北端6)red marked pole,指北极7)north-seeking pole,指北极8)north-finder based on laser gyro,激光陀螺指北仪9)north reference pulse,指北参考脉冲10)north relative motion,指北相对运动
