tracer

漢語翻譯

n. 追蹤者, 描圖者, 描繪工具
【計】 跟蹤程式
【化】 示蹤劑
【醫】 示蹤器; 示蹤物; 描記器

英文解釋：

名詞 tracer:

1. an investigator who is employed to find missing persons or missing goods
2. an instrument used to make tracings
3. (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
4. ammunition whose flight can be observed by a trail of smoke
   同義詞：tracer bullet