aha

啊哈、原来如此口语

Aha, so that's why the printer kept jamming all morning.

啊哈，原来印表机整个早上一直卡纸就是这个原因。

哈、逮到你了口语

Aha, I knew you were the one eating my cookies.

哈，我就知道偷吃我饼干的人是你。

顿悟的、豁然开朗的限定用法

That was the aha moment when the whole theory suddenly made sense.

那就是整个理论突然说得通的顿悟时刻。