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
It's a lovely area,
那里是个可爱的地方，
I doubt that I'll do anything tomorrow.
我不确定我明天将做什么事。
He told me that he loves me.
他说过他爱我。