aha

啊哈、原來如此口語

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

啊哈，原來印表機整個早上一直卡紙就是這個原因。

哈、逮到你了口語

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

哈，我就知道偷吃我餅乾的人是你。

頓悟的、豁然開朗的限定用法

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

那就是整個理論突然說得通的頓悟時刻。