Tracer atom
[化] 示踪原子
🧩 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
We had a cat when I was eight years old.
我八岁时养过一只猫。
Once a man and twice a child.
一次为成人，两度当小孩。
Annie was born in a poor family, on April 4th, 1866.
1866年4月4日，安妮出生在一个贫苦家庭中。