aha

剑桥词典

used when you suddenly understand or find something
（表示突然理解或发现某事物）啊哈，噢，嘿
Aha, now I see what you mean ! 噢！现在我明白你什么意思了！
Aha, that's where I put my keys ! 嘿！原来我把钥匙放那儿了！ 返回 aha