| 词汇 | wild card |
| 词源 | wild card. The term wild card has been known in card games since the early 16th century, meaning “a card whose value is determined by the players in a particular game.” Since then it has taken on special meanings in several sports, including ten- nis and football, and has come to mean generally anything out- side of the normal rules or categories, an unpredictable person, thing, or event. |
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