Based on the principle of flight of fan wing aircraft, realizing methods of VTOL are preposed by changing the Angle of attack and increasing chord length of the tail.
基于扇翼机的飞行原理，提出通过改变攻角以及增加尾部升力面弦长的方式提高气动效率，进而实现垂直升降的方法。
Harmony concerns the building of chord (tones played together) derived from the scale on which the music is based, and it also involves the order in which successions of chords accompany the melody.
构成音乐基础的音阶上的音构成和弦(即若干同时发响的音)，和声与和弦的构成有关，也与伴奏和弦的连接方法及进行规律有关。
Based on polygon convex hull method, the chord line is extracted.
采用了基于多边形凸包的方法提取弦线。
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