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[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
I would like to make a suggestion.
我想提个建议。
You'll burt yourself, if you don't take care.
你不专心的话，就会烧到你自己。
What's that?
那是什么？