| 释义 |
tracer/ˈtreisə/n. 1 a person or thing that traces 追踪者；追踪装置 2 Mil. 【军】a a bullet etc. whose course is made visible in flight because of flames etc. emitted (因发出火焰而使其飞行轨迹能被看到的)曳光弹 b such bullets etc. collectively, used to assist in aiming (用以帮助确定目标而集中发射的)曳光弹 3 an artificially produced radioactive isotope capable of being followed through the body by the radiation it produces 显迹同位素(人工生产的放射性同位素，可通过其放射的光而被跟踪) |