Tracer technique
[化] 示踪技术
🧩 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
That's good news.
这是个好消息。
Do you have the tickets, or not?
你到底有没有买票？
I was thinking about next Tuesday.
我想下个礼拜二。