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词汇
optional
释义
op·tion·al
/`ɑpʃənḷ; ˈɒpʃ
ə
nəl/
adj
if something is optional, you can choose to have it or do it, but do not have to 可选择的,非强制的:
The sunroof is optional. 车顶天窗是可供选择的额外配置。
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