The result is fish that are more or less immune to PCB poisoning.

其结果是此鱼类或多或少的对PCB产生免疫作用。

As is the way of evolution, however, some fish species have developed resistance to PCB poisoning.

然而，某些鱼种已经产生PCB抵抗，这就是进化。

It appears to work equally well, whether or not it has PCB passengers on board.

无论结合PCB与否，他们照样工作。

Two of them seem particularly resistant to the effects of PCBs.

其中的两种变异似乎具有特殊抵抗PCB的作用。

But PCBs are persistent chemicals, and their effects are felt even today.

但PCBs是惰性化工品，即便是今天，它们的影响依然存在。

And DDT and PCBs two of the most poisonous and long-lasting substances known continue to threaten aquatic wildlife.

滴滴涕和多氯联苯是已知的两种毒性和持久性最强的物质，它们继续威胁水中的野生动物。

So BGA devices some security conscious PCB design and PCB routing can make a big difference.

因此，BGA器件、一些安全意识的印刷电路板设计和印刷电路板布线可以起到很大的作用。

They also provide PCB  assembly services where they populate and solder the components to the PCB.

他们还提供 PCB 组装服务，将组件安装并焊接到 PCB 上。

For this, engineers had another innovation: printed circuit boards, or PCBs.

为此，工程师们进行了另一项创新：印刷电路板或 PCB。

Printed circuit boards or PCBs are everywhere  and inside this mouse, you can find four of them.

印刷电路板或 PCB 无处不在，在这款鼠标中，您可以找到其中的四个。