double by-election是什么意思呀

double by-election是什么意思呀 什么是by-election by-election 变复数是啥?介词＋名词是后面的名词变复数嘛? election returns在中文是啥意思 int on_a_line(double ax,double ay,double bx,double by,double cx,double cy) { double dx1,dy1,dx2,dy2上述代码能证明 闪电共线 #include #define DELTA 1e-9int on_a_line(double ax,double ay,double bx,double by,double cx,double cy){double dx1,dy1 找一艘英文歌 高潮貌似是 double di double da double di double da 民心所向 奥巴马 BY THE PEOPLE THE ELECTION OF BARACK OBAMA怎么样 double double double double double double double double Double double double