名词
中文翻译：Unknown
同义词：
['tracer concentration', 'tracer concentration level', 'tracer concentration level']
例句：
-
1. Thescientists used a tracer to study the movement of water in the river.
科学家们使用示踪剂来研究河水中水的运动。
-
2. The tracer level was too high, which could be dangerous for the environment.
示踪剂水平过高，对环境可能构成危险。
-
3. The researchers found that the tracer level had decreased significantly since the experiment began.
研究人员发现，自从实验开始以来，示踪剂水平已经显著下降。