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
Can you confirm that the meeting is at 9:00 a.m.?
你能否确认一下，开会的时间是早上9点吗？
How long is Jones Boulevard?
琼斯大街有多长？
Inevitably the repair job was not quite so simple.
事实上，修理工作远不是那么简单。