单词：tracers
(tracer 的复数) n. 追踪者, 描图者, 描绘工具
[计] 跟踪程序
[计] 跟踪程序
plural of tracer
n. an investigator who is employed to find missing persons or missing goods
n. an instrument used to make tracings
n. (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
n. an investigator who is employed to find missing persons or missing goods
n. an instrument used to make tracings
n. (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes