常见的是如何在环境多氯联苯？

How common are PCBs in the environment?

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这可以消除多达50%的多氯联苯。

This can remove up to 50% of the PCBs.

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什么时候，为什么停止生产多氯联苯？

When and why did production of PCBs stop?

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多氯联苯导致人类癌症做呢？

Do PCBs cause cancer in humans?

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多氯联苯是天然物质？

Are PCBs natural substances?

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目的研究多氯联苯对大鼠学习记忆能力的影响。

Objective To observe PCB affect the ability of learning and memory in rats.

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多氯联苯的几个性质使他们许多宝贵的用途。

Several properties of PCBs made them valuable for many purposes.

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汞和多氯联苯最终如何存在于鱼类和粮食中的呢？

How do mercury and PCBs end up in fish and the food supply?

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汞和多氯联苯最终如何存在于鱼类和粮食中的呢？

How do mercury and PCBs end up in fish and the food supply?

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