1.the smallest whole number or a numeral representing this number;

he has the one but will need a two and three to go with it

2.one of four playing cards in a deck having a single pip on its face

3.someone who is dazzlingly skilled in any field

4.a serve that the receiver is unable to reach

5.of the highest quality;

an ace reporter

1.succeed at easily;

She sailed through her exams

2.score an ace against;

He aced his opponents

3.play (a hole) in one stroke

4.serve an ace against (someone)

1 . Our superior technology is our ace in the hole.

我们超众的技术是我们的法宝。

来自柯林斯例句

2 . That is the third ace that he has served this match.

那是他在这场比赛中的第3次发球得分.

来自《简明英汉词典》

3 . The child came within an ace of being drowned.

孩子差一点儿淹死了.

来自《现代英汉综合大词典》

4 . I'll not wag an ace further.

我一步也不再动啦.

来自《现代英汉综合大词典》