| 关键HSK 4 | guān jiàn | crucial point; crux; Classifiers: 个 ; key; crucial; pivotal | |
| 键盘HSK 5 | jiàn pán | keyboard | |
| 关键词 | guān jiàn cí | keyword | |
| 按键 | àn jiàn | button or key (on a device); keystroke; Classifiers: 个 ; to press a button | |
| 琴键 | qín jiàn | a piano key |
| 1 | Decisions at a crucial moment | |
| 2 | Courage is one of the keys to success. | |
| 3 | Confidence is one of the keys to success. | |
| 4 | Please underline, this is crucial | |
| 5 | Mutual understanding is the key to solving problems. |