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
As a matter of fact,
事实上，
Where your will is ready, your feet are light.
下定了决心，脚步就轻盈。决心一下，脚下生风？
Last year, we were travelling across the Channel and Jane put a piece of paper with her name and address on it into a bottle.
去年，当我们横渡英吉利海峡时，简把写有她姓名和住址的一张纸条装进了一只瓶子，