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
Do you hike or fish on your trips?
旅游时，你会步行或钓鱼吗？
How is your family?
你的家人怎么样？
Maybe it was useful for some people, but it wasn't for me.
它可能对一些人有用，但对我没用。