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
on the farm.
在农场。
Factories employ both male and female workers.
工厂雇用男性和女性的工人。
Granted, a snobbery of camping itself, based upon equipment and techniques, already exists,
诚然，露营地本身也存在以露营装备和方式取人的势利现象，