tracer的中文翻译
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tracer1
UK
/ˈtreɪsə(r)/
US
/ˈtreɪsər/
曳光弹
noun
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a bullet or shell(= a kind of bomb) that leaves a line of smoke or flame behind it
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a radioactive substance that can be seen in the human body and is used to find out what is happening inside the body