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tracer

美音:[´treısə ]点这儿播放单词美音发声
英音:[´treısə ]点这儿播放单词英音发声
n.追踪者,描图者,(铁笔等)绘图工具

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tracer为短语/超纲词汇

tracer


n
1 person or thing that traces 追踪者; 追踪装置; 描摹者; 描摹工具.
2 bullet or shell whose course is made visible by a line of smoke, etc left behind it 曳光弹
*[attrib 作定语] tracer bullets 曳光弹.
3 radioactive substance whose course through the human body, etc can be traced by the radiation it produces, used for investigating a chemical or biological process 示踪物.

tracer


n [U and C]
a bullet that leaves a line of smoke or flame behind it