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。
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.
研究了三角形周长平分弦的性质，得出任一三角形均可确定其最长和最短周长平分弦。
Discuss the properties of the perimeter bisection chord of a triangle, give any triangle, its longest and shortest bisection chords can be determined.
一种三角形俄国乐器，有三根弦，发出类似于曼陀林琴的声音。
Russian instrument with a triangular body and three strings that produces sounds similar to those of a mandolin.
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