This flashcard defines 'vain,' an adjective referring to having or showing an excessively high opinion of one's appearance, abilities, or worth.
此闪卡定义了vain，形容词，意为徒劳的、空虚的或自负的。
| Front | vain [va(i)n] |
|---|---|
| Back | a.徒劳的;空虚的； 自负的 |
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