Tracer element
[化] 示踪元素
🧩 词语组成解析
tracer
['treisə]
n. 追踪者，描图者，（铁笔等）绘图工具;
element
['ɛləmənt]
n. [化]元素;要素;原理;[电]电阻丝;
🗣️ 情景例句
There are several tours of the Grand Canyon.
到大峡谷有好几个旅游团。
You'll drop it, if you don't teke care.
你不专心的话，就会掉下。
It's tomorrow at twelve o'clock, right?
是明天12点吧？