optional
🇺🇸
/ˈɑːpʃənl/
🇬🇧
/ˈɒpʃənl/
adjective
R
something you can choose to have or not have
The extra insurance is optional, so you can decide if you want it or not.
额外保险是可选的，所以你可以决定是否需要它。
translation
可选的