coaxial heli copter

例句：

1. 1. The coaxial helicopter was used for emergency medical services.
   这种同轴旋翼无人机被用于紧急医疗服务。
2. 2. The coaxial heli copter was able to fly at high altitudes without the need for refueling.
   这种同轴旋翼无人机能够在不需要加油的情况下在高空飞行。
3. 3. Thecoaxial heli copter was equipped with advanced sensors and communication systems.
   这种同轴旋翼无人机配备了先进的传感器和通信系统。