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
on the community-center project.
为社区中心的事。
You think too much.
你想太多了。
We also played games on the sand.
我们还在沙滩上做游戏呢。