| 必需 | bi4 xu1 | to need |
| 纲要 | gang1 yao4 | summary |
| 要素 | yao4 su4 | key constituent |
| 要点 | yao4 dian3 | main point |
| 主流 | zhu3 liu2 | fig. the essential point |
| 末 | mo4 | tip |
| 要领 | yao4 ling3 | gist |
| 内涵 | nei4 han2 | content |
| 切切 | qie1 qie1 qie4 qie4 | eagerly |
| 赖氨酸 | lai4 an1 suan1 | lysine (Lys), an essential amino acid |
| 末节 | mo4 jie2 | minor detail |
| 必需品 | bi4 xu1 pin3 | Needful Things |
| 组氨酸 | zu3 an1 suan1 | histidine (His), an essential amino acid |