How were PCBs used ?

多氯联苯是如何使用 ？

This can remove up to 50% of the PCBs .

这可以消除多达50%的多氯联苯。

One possible source of PCBs is biomass burning, which is thought to release PCBs previously deposited in the soil.

生物体燃烧可能释放寄存在土壤里的氯联苯。

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

汞和多氯联苯最终如何存在于鱼类和粮食中的呢？

Storage of PCBs in humans of 0.5 to 2 grams of lead to poisoning.

人体内多氯联苯的储存量达到0.5～2克时会引发中毒。

Pcbs do not break down in soil, water or air, but carry on accumulate.

多氯联苯在土壤中, 水中或空气中都无法分解, 只会继续累积.

They also contain much higher levels of cancer causing dioxins and PCBs.

此外，它们还含有二氧(杂)芑和多氯联苯，大大增加了致癌风险。

I have used my own PCB as the two PCBs were defective and could not be used.

试验的时候，我用的是我自己的PCB板，因为你们的那2款PCB是有问题，没办法使用。

Another probable source of the PCBs is one of the world's largest ships' graveyards.

另一个可能的氯联苯污染源是世界上最大船只墓地，努瓦迪布（毛里塔尼亚西北部港市）南部。

If mercury, lead and PCBs impair intellectual development, then less should be more.

要是水银 、 铅和多氯联苯会损及智能发展, 就应该少碰为妙.