oxygen gas

例句：

1. 1. Oxygen is essential for the survival of all living organisms.
   氧气对于所有生物的生存都是必需的。
2. 2. The process of combustion requires a certain amount of oxygen gas.
   燃烧过程需要一定量的氧气气体。
3. 3. The lungs are responsible for delivering oxygen gas to the bloodstream.
   肺部负责将氧气气体输送到血液循环中。