Level 5 · word 6,001 of 20,000
optional
/ˈɑːpʃənəl/
American
- adj. 可选的, 非必须的
- Definition
- adj. available as a choice but not required
- Example
- Attending the meeting is optional, so come only if you can.
- 参加会议是自愿的，能来就来，不强求。
Word familyopt-