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
Not too bad, thank you.
挺好的，谢谢你。
Then the whole family sits around the table, feasting and welcoming the first day of the new year.
然后全家围坐在桌旁吃团圆饭，迎接新年第一天的到来。
Class 3 and Class 1 were in front!
他们两人同时传出接力棒。这时3班和1班在前边！