| 词汇 | tracer |
| 释义 | tracerBrE /ˈtreɪsə(r)/ NAmE /ˈtreɪsər/ noun a bullet or shell(= a kind of bomb )that leaves a line of smoke or flame behind it 曳光弹(specialist ) a radioactivesubstance that can be seen in the human body and is used to find out what is happening inside the body 示踪剂 |
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