The adjective "optional" means available to be chosen but not required.
形容词“optional”表示可选择的或随意的。
| 单词 | optional |
|---|---|
| 音标 | [ˈɒpʃənl] [ˈɑ:pʃənl] |
| 释义 | adj.["可选择的","随意的，任意的","非强制的","选修科目"] |
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