Aeronautics【航空】
- a controlled dive or downward flight at a steep angle, especially by an aeroplane with the engine shut off（尤指飞机在引擎关闭状态下的）俯冲; 急剧下降。
no obj., with adverbial of direction
- (of an aeroplane) make such a dive or downward flight（飞机）俯冲; 急剧下降。
词源
early 20th cent.: from French vol plané, literally 'glided flight'.