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
I think we're going to be good friends.
我想我们可以成为好朋友。
Next week I must start my term paper for Poli Sci.
到下周，我必须着手写政治学的期末论文了。
He's putting on his school clothes.
他在穿校服。