柯林斯词典tracer /ˈtreɪsə/ 1. N a person or thing that traces 追蹤者; 追蹤器 返回 tracer剑桥词典a bullet that leaves a line of flame or smoke behind it when it is fired , so that you can see the direction it has taken 曳光彈 Tracer bullets streaked through the sky . 曳光彈劃過長空。 The sky was bright with tracer fire . 曳光彈發出的火光照亮了天空。 返回 tracer