| 单词 | optional |
|---|---|
| 音标 | 英[ˈɒpʃənl] 美[ˈɑpʃənl] |
| 解释 | adj.可选择的;随意的，任意的;非强制的;选修科目; |
| 例句 | ADJ 可选择的；非强制的 If something is optional, you can choose whether or not you do it or have it. 例：A holiday isn't an optional extra. In this stressful, frantic world it's a must...休假并非可有可无。在这个紧张而忙碌的世界，它是必不可少的。 例：Sex education is a sensitive area for some parents, and thus it should remain optional.性教育对某些家长而言是个敏感领域，因此应该保持其非强制性。 |
| 变形 |
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