"Necessary" • Chinese-English Dictionary
| 必要 | bì yào | necessary / essential / indispensable / required |   |
| 所需 | suǒ xū | necessary (for) / required | |
| 不可或缺 | bù kě huò quē | necessary / must have | |
| 先决 | xiān jué | prerequisite / necessary | |
| 随时 | suí shí | at any time / at all times / at the right time / whenever necessary | |
| 必不可少 | bì bù kě shǎo | absolutely necessary / indispensable / essential | |
| 用得着 | yòng de zháo | to be able to use / useable / to have a use for / (in a question) to be necessary to | |
| 必要条件 | bì yào tiáo jiàn | requirement / necessary condition (math) | |
| 势在必行 | shì zài bì xíng | circumstances require action (idiom) / absolutely necessary / imperative | |
| 赘述 | zhuì shù | to say more than is necessary / to give unnecessary details | |
| 充要条件 | chōng yào tiáo jiàn | necessary and sufficient condition | |
| 大气科学乃必要基础学科讲习班 | workshop on atmospheric sciences as a necessary basic discipline | | |
| 基本盘 | jī běn pán | (political party's) voter base / (musician's) fan base / (a business's) customer base / the funds necessary for a venture / foundation on which sth's existence depends / bedrock (in the figurative sense) | |
