optional
柯林斯词典
1. ADJ If something is optional, you can choose whether or not you do it or have it. 可选择的
Sex education is a sensitive area for some parents, and thus it should remain optional. 性教育对一些家长来说是个敏感的话题，因此应该还是非强制性的。
返回 optional
optional /ˈɒpʃənəl/
剑桥词典
- If something is optional, you can choose if you want to do it, pay it, buy it, etc.
- Seat-belts are included as standard but electric windows are an optional extra .
- My phone came with 20 optional ringtones .
- Do come to the party - fancy dress is optional.
- There are several optional tours , for which there will be a small charge .
- The basic model is quite cheap , but there are a lot of optional extras . 返回 optional
可选择的；非强制的
English is compulsory for all students , but art and music are optional. 英语是所有学生的必修课，而艺术和音乐则是选修的。
例句