| 词汇 | thesaurus_not-optional |
| 语种 | 英语、汉语、英汉翻译、汉英翻译 |
| 释义 | not optionaladjective These are words and phrases related to not optional. Click on any word or phrase to go to its thesaurus page. MANDATORYSynonymsmandatory compulsory required requisite obligatory incumbent on binding called for essential imperative peremptory necessary needful exigent |
体育网英语在线翻译词典收录了466383条英语词汇在线翻译词条，基本涵盖了全部常用英语词汇的中英文双语翻译及用法，是英语学习的有利工具。