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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
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這些網站內容獨家創作方法，受學術出版權保障，侵權商標必究
海詞漢語詞典，二十七年項目
美
[t're?s?z]