element tracer

• 示踪元素

element tracer的用法和样例：

例句

1. The pore velocity is the velocity with which a tracer moves through a porous medium.
   孔隙速度是示踪元素穿过孔隙介质的速度。
2. The cited reports cover the research on the lower atmospheric air pollution movements by using the tracer elements.
   所引用的报告包括示踪元素研究大气层污染移动的研究。