At Fukushima it has been necessary to release gases because the containment pressure became too high.

但在福岛则不同，释放气体是必须的以避免防泄漏系统内部压力过高。

youdao

The purpose of this is to reduce pressure in the containment and to essentially mobilise some of the fission products.

这的目的就是减少容器里的压力，然后等够将一些，裂变生成物赋予可动性。

youdao

Water in the core began to boil off, raising the temperature and pressure inside the massive steel containment vessel.

堆芯的水开始沸腾，导致钢结构的安全壳内部的温度和压力开始升高。

youdao

And we're looking to increase production, as I said, so we can slowly close those vents and see how the containment cap is working and whether or not any oil is forced down by the pressure through the rubber seals, as we've talked about before.

WHITEHOUSE: Daily Press Briefing