1N-COUNT 未知数;未知因素 If you refer to someone or something as a wild card in a particular situation, you mean that they cause uncertainty because you do not know how they will behave. 未知数;未知因素
The wild card in the picture is Eastern Europe. [+ in]
整个局势中的变数是东欧。
2N-COUNT (给予没有正常参赛资格的选手准其参加比赛的)“外卡”;“外卡”选手 If a sports player is given a wild card for a particular competition, they are allowed to play in it, although they have not qualified for it in the usual way. You can also use wild card to refer to a player who enters a competition in this way. (给予没有正常参赛资格的选手准其参加比赛的)“外卡”;“外卡”选手
Andre Agassi accepted a wild card to play in the Stockholm Open.
安德烈·阿加西持外卡参加了斯德哥尔摩公开赛。
3N-COUNT (用于代替任何字符或字符串的)通配符 A wildcard is a symbol such as * or ? which is used in some computing commands or searches in order to represent any character or range of characters. (用于代替任何字符或字符串的)通配符 [computing]