单词：tracer-free
tracer-free的用法和样例：
例句
- This solute will be referred to as a tracer.这种溶质称为示踪剂。
- The tracer becomes increasingly dispersed.示踪剂逐渐地扩散。
- We continuously inject a tracer into a point in a steadily moving fluid.我们连续地将一种示踪物注入某稳定运动流体中之一点。
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