1. C A纸牌　a playing card with a large single symbol on it, which has either the highest or the lowest value in a particular card game
2. C 〈非正〉擅长…的人　a person who is very good at doing sth
3. C 发球得分　that is so good that your opponent cannot reach the ball

　flying ～　飞行顶尖高手
　soccer ～　足球顶尖高手
　tennis ～　网球顶尖高手
　～ at chess　下国际象棋的能手
　～ at solving puzzles　填字谜的能手
　the ～ of clubs　梅花A
　the ～ of diamonds　方块A
　the ～ of hearts　红心A
　the ～ of spades　黑桃A
　within an ～ of　离…只差一点儿，几乎

　In card games, the ace often has the highest number of points.　在纸牌游戏中，A牌常代表最高分数。
　He was a flying ace in the First World War.　他是一战时的飞行专家。
　She served and got an ace.　她发球并得分。
　He served 15 aces in the match.　他在这场比赛中发球得分15次。
　He's an ace at baseball.　他是位优秀的棒球选手。
　She's an ace at tennis.　她是一个网球能手。
　Tom is an ace at cards.　汤姆是玩牌高手。
　That's the third ace that Violente has served this match.　那是瓦奥兰特在这场比赛中的第三次发球得分。

 ♣ an ace up one's sleeve 　
　秘藏的王牌；应急的妙计；锦囊妙计　a secret or hidden advantage that you can use when you need it
　〔说明〕 本短语是英式英语，美式英语是an ace in the hole.
　He thinks he's won but I've got an ace up my sleeve.　他以为他赢了，但我自有取胜的妙招。
 ♣ hold all the aces　
　〔说明〕 本短语还可说have all the aces. 占尽一时地利人和have all the advantages in a situation
　It was a battle of wits, with Sandra holding all the aces.　那是一场智斗，桑德拉占尽了上风。
 ♣ play one's ace　
　打出王牌；使出绝招use your best argument, etc.，　in order to get an advantage in a situation
　Many pretty girls played their ace.　许多漂亮姑娘都使出了绝招。
 ♣ within an ace of　
　〈英·非正〉差一点儿；几乎 very close to (a condition); almost doing sth, or nearly succeeding in doing it
　We were within an ace of success.　我们差点儿就成功了。
　We came within an ace of victory.　我们差一点儿就要胜利了。
　He came within his ace of being run over.　他险些被车子从身上碾过。

　〈非正〉第一流的；极好的 very good or very skilled; excellent

　ace　用作形容词时意思是“第一流的”，在句中可用作定语或表语，不用于比较等级。

　～ marksman　神枪手
　～ pilot　第一流的飞行员
　～ pitcher　优秀的投手
　～ player　第一流的选手
　～ reporter with the newspaper　该报最棒的记者
　～ skier　第一流的滑雪者
　～ swimmer　第一流的游泳选手

　That's an ace bike you've got there.　你那辆自行车是一流的。
　We had an ace time.　我们过得真痛快。
　Their new record's really ace!　他们新灌的唱片真是没得说！
　Their new song is ace!　他们的新歌太棒了！