| 二氧化碳HSK 6 | èr yǎng huà tàn | carbon dioxide CO2 | |
| 氧气HSK 6 | yǎng qì | oxygen | |
| 氧化 | yǎng huà | to oxidize | |
| 二氧化硫 | èr yǎng huà liú | sulfur dioxide SO2 | |
| 臭氧 | chòu yǎng | ozone (O₃) |
| 1 | Oxygen is an important gas. | |
| 2 | We can only rely on oxygen therapy to alleviate altitude sickness. | |
| 3 | This chemical reaction will generate a huge amount of carbon dioxide. | |
| 4 | He decided to preserve the last breath of air for someone else to use. | |
| 5 | Green tea is rich in antioxidants and helps protect the body's health. |