Tracer composition
[化] 曳迹剂
🧩 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
Oh, you'll do it. It's a piece of cake.
噢 你办得到的。这不费吹灰之力。
Repentance is good, but innocence is better.
悔罪虽好，无罪更佳。
What's the matter, Andy?
怎么了，安迪？