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tracer (element)的英文翻譯是什麼意思，詞典釋義與在線翻譯：
英英釋義
名詞 tracer:
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an investigator who is employed to find missing persons or missing goods
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an instrument used to make tracings
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(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
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ammunition whose flight can be observed by a trail of smoke
