wild card

n.

未知数；外卡；通配符；

复数：wild cards

Wild card
Wild card
Wild Card
Slot machine game with roaming wild card
The researcher's own therapy allegiances: A "wild card"in comparisons of treatment efficacy.
On the Perils of Financial Intermediaries Setting Security Prices: The Mutual Fund Wild Card Option
Wireless the wild card in M&As
GP fundholding: wild card or winning hand?
Getting Along Without Regulation Q: Testing the Standard View of Deposit- Rate Competition During the "Wild-Card Experience"
Valuation and Optimal Exercise of the Wild Card Option in the Treasury Bond Futures Market