n.（名词）
1. Games
【游戏】
2. A single spot or pip on a playing card, die, or domino.
一点，幺点：纸牌、骰子或骨牌中的幺点或一点
3. A playing card, die, or domino having one spot or pip.
幺点纸牌，幺点骰子，幺点骨牌：带有一点或幺点的纸牌、骰子或骨牌
4. Sports In racket games:
【体育运动】 在板球运动中
5. A serve that one\'s opponent fails to return.
得分的发球：发球后对方未能击回
6. A point scored by such a serve.
发球得分
7. Sports The act of hitting a golf ball in the hole with one\'s first shot.
【体育运动】 一杆进洞，一杆得分：一杆将高尔夫球击入洞中的行为
8. A military aircraft pilot who has destroyed five or more enemy aircraft.
王牌驾驶员：空军中击落五架或五架以上敌机的飞行员
9. An expert in a given field.
佼佼者，优异者：某一领域的专家
adj.（形容词）
Topnotch; first-rate.
杰出的；第一流的
v.tr.（及物动词） aced,ac.ing,ac.es
1. Sports To serve an ace against.
【体育运动】 发球得分
2. Sports To hit an ace in golf.
【体育运动】 一杆进洞：在高尔夫球赛中一杆进洞
3. Slang To get the better of (someone):
【俚语】 占据优势：
a candidate who aced his opponents in the primaries.
在预选中领先其对手的候选人
4. Slang To receive a grade of A on:
【俚语】 成绩为A：
She aced the exam.
她在考试中得了A
习惯用语:
ace in the hole
A hidden advantage or resource kept in reserve until needed.
锦囊妙计：隐藏的优势或资源，一直保存到需要时
within an ace of
On the verge of; very near to:
差一点，几乎；非常接近：
came within an ace of losing the election.
几乎失去竞选
什么是ace呢？能不能给我们一个语境