Then there was the blowout preventer, a huge stack of valves on the sea floor.

现在来谈一谈坐落在海底，由一层层厚厚的阀门组成的防喷阀。

youdao

Then there was the blowout preventer, a huge stack of valves on the sea floor.

现在来谈一谈坐落在海底，由一层层厚厚的阀门组成的防喷阀。

youdao