tracern.追踪者(器)；示踪物；曳光弹；[化]示踪剂tracer flowmeter示踪式流量计tracer ammunition曳光弹药tracer controller仿形控制器Tracer Expcriment示踪实验tracer experiment示踪实验tracer technology示踪技术tracer irradiatedadj.示踪物辐照的tracers placement追踪部署tracer separation扫变分离tracer resolution扫描线分辨率