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
What do you think of the terms of payment?
关于付款条件你们有什么意见？
Change is in the air.
人们感觉即将发生变革。
local epidemics of this disease could be created.
就可以使这种疾病在一个地区蔓延起来。