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词汇 tracer
释义

tracer

noun
/ˈtreɪsə(r)/
/ˈtreɪsər/
  1. a bullet or shell (= a kind of bomb) that leaves a line of smoke or flame behind it曳光弹
    • tracer bullets曳光弹。
  2. (specialist) a radioactive substance that can be seen in the human body and is used to find out what is happening inside the body示踪剂
    • Radioactive tracers have been used to map the metabolic activity of the brain.放射性示踪剂已经被用来绘制大脑的代谢活动。
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