To hover means to stay in the same position in the air without moving forward or backward. Many birds and insects can hover by moving their wings very quickly.
submersible adj.能潜水的
interfaces n.(计算机通信的)接口,界面
thermostat n.恒温器
rotor-wing n.旋翼
stall n.失速
blade n.(飞机螺旋桨的)桨叶
terrain n.地势,地形
terrain following 地形跟踪
sonar n.声呐,声波定位仪
compatible adj. 兼容的,可共存的
bidirectional adj.双向的,双向作用的
This transmitter and receiver support bidirectional communication.