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TOEFL IELTS BNC: 5815 COCA: 5692

B2 If something is optional, you can choose if you want to do it, pay it, buy it, etc.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。

More examples

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.


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