| 二者 | èr zhě | both; both of them; neither | |
| 二战 | èr zhàn | World War II | |
| 二氧化碳HSK 6 | èr yǎng huà tàn | carbon dioxide CO2 | |
| 一二HSK 1 | yī èr | one or two; a few | |
| 二氧化硫 | èr yǎng huà liú | sulfur dioxide SO2 |
| 1 | Two plus two equals four. | |
| 2 | Today is February 2nd. | |
| 3 | Twenty yuan is enough. | |
| 4 | I want to sell my second-hand car. | |
| 5 | I am going to see a movie on Tuesday. |