This card shows the word forms derived from "option" (noun), introducing the adjective "optional".
此卡片展示了“option”（选择）一词的词性转换，引出了形容词“optional”。
| 知识 | option [n]选择 optional [adj] |
|---|---|
| 《》 | 词性转换 |
Tags: 英语词性转换
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