| 词汇 | thesaurus_not-required |
| 释义 | not requiredadjective These are words and phrases related to not required. Click on any word or phrase to go to its thesaurus page. OPTIONALSynonymsoptional left to one's choice individually decided elective voluntary nonobligatory volitional unforced discretionary discretional available at additional cost open-ended open allowable Antonymsmandatory obligatory required compulsory ELECTIVESynonymselective optional not obligatory voluntary selective discretionary open to choice Antonymsrequired obligatory necessary |
反思网英语在线翻译词典收录了377474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。