We came within an ace of victory.

我们差一点儿就要胜利了。

We were within an ace of success.

我们差点儿就成功了。

I was within an ace of calling for help.

我差一点就要喊救命了。

I came within an ace of dismissing him then.

那时我几乎要把他解雇。

The child came within an ace of being drowned.

孩子差一点儿淹死了。