This paper introduces isotope tracing technique, including artificial and environmental isotope tracing technique, and its application on the survey of dike and dam leakage.

本文介绍了堤坝渗漏探查的同位素示踪技术，包括人工同位素单孔示踪技术和环境同位素示踪分析技术。

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The test, called a carbon isotope ratio test, can distinguish naturally produced from artificial testosterone.

NPR: Landis Facing Uphill Battle on Doping Charges