And if the mountain is very high, you have to have an oxygencontainer or cylinder for easier breathing.
如果山很高,你得带上氧气罐以便缓解呼吸困难。
2
They fill the container with pure air made by evaporating liquid nitrogen and liquid oxygen, and add water vapour and some trace gases.
他们将容器充满由蒸发液态氮和液态氧得到的纯空气,再加入水蒸气和一些痕量气体。
3
The explosion, he said, was due to hydrogen buildup in the steam piping that mixed with oxygen, and that there was no damage to the container with the nuclear fuel.