Tracer elements
[医] 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;
n. 原理, 基础
🗣️ 情景例句
This is a wonderful example of Spanish-style architecture.
这是栋很棒的典型西班牙式建筑。
I always used to ask him a lot of questions.
我过去总是问他很多问题。
What's wrong with you?
你怎么回事？