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
that the taxpayers will vote for him
纳税人会投他一票
Ok, bye-bye.
好吧，再见。
I waited till he came near, then I asked him the way to our old village.
等他走近了，问他去老家的路。