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，它们影响依然存在。

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。

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

其结果是此鱼类或多或少对PCB产生免疫用。

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

其中两种变异似乎具有特殊抵抗PCB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。

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两种毒性和持久性最强物质，它们继续威胁水中野生动物。

And what about the pre - soldering preparation? Like cleaning the PCB and components.

答：那么预焊准备呢？比如清洁 PCB 和组件。

PCBWay can quickly manufacture your PCBs with competitive prices and impeccable standards.

PCBWay 可以以有竞争力价格和无可挑剔标准快速制造您 PCB。

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

因此，BGA器件、一些安全意识印刷电路板设计和印刷电路板布线可以起到很用。

We use a stencil to apply the solder paste precisely onto the PCB pads.

我们使用模板将焊膏精确地涂在 PCB 焊盘上。

In reflow soldering, the PCB with the placed components goes through a reflow oven.

B：在回流焊中， 带有放置元件 PCB 通过回流炉。

PCBs do their damage by binding to a protein called the aryl hydrocarbon receptor, or AHR, thus stopping it working properly.

PCB危害来源于它们结合一种称为芳香烃受体（AHR）蛋白质，从而停止该类蛋白正常运转。

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。

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。

After having spilled PCBs and other pollutants into the river in the 1970s, many industries simply moved leaving the contaminated sites behind.

在上世纪70年代，多氯联苯和其他污染物排入河流后，许多行业搬离了这些受污染地方。

If it's too fast or too slow, it can affect the dwell time of the PCB in the soldering zone.

如果太快或太慢， 都会影响 PCB 在焊接区停留时间。

PCBWay also offers Turnkey PCB Assembly services to assist you in populating your PCBs.

PCBWay 还提供交钥匙 PCB 组装服务，以帮助您填充 PCB。

You've got the PCB, the casing, the plate, which kind of make up the brains and the body of the keyboard.

你有PCB，外壳，板，它们构成了脑和键盘主体。

The casing sort of houses all of the components while the PCB is the actual electronic circuit that communicates with your computer.

外壳容纳了所有组件，而 PCB 是与计算机通信实际电子电路。

This PCB functions similarly to the keyboard matrix, but now we have an LED under  each key to create attractive designs.

该 PCB 功能与键盘矩阵类似，但现在我们每个按键下方都有一个 LED， 以创建有吸引力设计。