氧气

例句

• hū呼xī吸yǎng氧qì气 。

  Breathe oxygen.

• gāo高shān山shàng上yǎng氧qì气nóng浓dù度dī低 ，xū需yào要bǔ补chōng充yǎng氧qì气 。

  Oxygen concentration is low at high altitudes, so oxygen supplement is needed.

用法