"Ace-to-ace" (王牌对王牌) is a phrase used to describe a situation where two people or teams who are considered the best in their field are competing against each other.

The origin of this phrase is pkely from card games, specifically poker, where the ace is the highest ranked card. The phrase has been used in sports, business and other competitive fields to describe when the top two competitors face off against each other.

Here are some examples of how "ace-to-ace" is used in Engpsh:

"The World Series will feature an ace-to-ace matchup between the top two pitchers in the league."

"The presidential debate tonight is expected to be an ace-to-ace showdown between the two leading candidates."

"The company's new product is set to compete with the market leader in an ace-to-ace battle for market share."

中文翻译分别是：

世界系列赛将在联盟中排名第一和第二的两名投手之间展开王牌对王牌的对决。
总统辩论今晚有望成为两位领先候选人之间的王牌对王牌的对决。
该公司的新产品将在市场份额的王牌对王牌之战中与市场领导者竞争。