optional
柯林斯詞典
1. ADJ If something is optional, you can choose whether or not you do it or have it. 可選擇的
Sex education is a sensitive area for some parents, and thus it should remain optional. 性教育對一些家長來說是個敏感的話題，因此應(yīng)該還是非強(qiáng)制性的。
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optional /??p??n?l/
劍橋詞典
- 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
可選擇的；非強(qiáng)制的
English is compulsory for all students , but art and music are optional. 英語是所有學(xué)生的必脩課，而藝術(shù)和音樂則是選脩的。
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