Radioactive tracer
[化] 放射性示踪剂
🧩 词语组成解析
tracer
['treisə]
n. 追踪者，描图者，（铁笔等）绘图工具;
🗣️ 情景例句
have been busy at work this morning
一早上都在忙着
It's pleasure to meet you.
幸会，幸会。
Yes, please.
好的。