以后我可不要和氧气筒为伍喔！

I don't want to be tethered on an oxygen tank.

再之后,又听说他病得很严重,命在旦夕,随时皆需仰仗氧气筒维持著下一口气.

Then I heard that he was so ill that he needed an oxygen tank to survive.

登山者通常会携带氧气筒,在极高的地带空气相当稀薄.

Mountain climbers often carry oxygen tanks because the air is very thin at high altitudes.