wild card

音标发音

The six-times world title-holder was given a wild card to the professional tour after winning her last 61 matches.
该位六次世界冠军保持者在她的61场比赛赢得胜利后，获得了职业巡回赛的外卡。
It will have a series of specs that include a priority number and a wild card expression to match a load name or names.
它将使用一系列的规范，其中包括优先级编号以及一个通配字符表达式，以便与加载名称进行匹配。
Another wild card here is that there is no definitive estimate of how much methane in this hydrate/clathrate form exists in our seas and oceans.
这里另一不确定因素是无法明确估算在我们的海域和海洋中到底有多大量以水合物/包合物形式存在的甲烷。

One council diplomat said Lebanon could prove to be something of a wild card on Middle East issues particularly Iran's nuclear ambitions.

There is an upside, though: a wild card play-in restores the premium of winning your division.
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The winner of that will get a wild card spot in my Play Pro 2013 Contest.
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The wild card at CTIA this year will likely be CNBC personality Jim Cramer.
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(IN CARD GAME) a playing card that does not have any particular value but that can be used to represent any other card
(COMPUTING) in computers, a symbol that has no particular meaning of its own so that its space can be filled by any real character that is necessary
(COMPETITION) someone who is allowed to take part in a competition, even though they have not achieved this in the usual way, for example by winning games
(NOT KNOWN) someone or something whose behaviour is sometimes unexpected

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.
A wildcard is a symbol such as * or ? used in some computing commands or searches in order to represent any character or range of characters. (*?)
In card games, if a particular card is named as a wild card, the player who holds it may give it any value he chooses.