To investigate the hurricane activity of the Pliocene, the researchers relied on proxy ocean temperatures based on variations in several chemical tracers in drill cores of the ocean floor.

为了研究上新世的飓风活动情况，研究人员依靠的就代理海洋温度，这个温度是基于洋底岩芯里几种化学示踪剂变化引起的。

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Used to identify the source of production in a well, these chemical-based tracers may play an important role in the shale industry's effort to come up with more cost-effective fracture designs.

这些化学示踪剂用来确定生产井的生产来源，这在页岩气行业中对致力于更划算的压裂设计有重要意义。

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Some scientists have proposed adding chemical tracers to fracking fluids as a way of confirming that any contamination of drinking water comes from the drilling process.

BBC: Fracking: Untangling fact from fiction