ah [ɑ:]

以下由轻松背单词网站提供

int. 啊!呀!嗳!哈!(表现痛苦，感叹，惊奇，怜惜，厌弃，欢喜等)

used to express understanding , pleasure , pain , surprise or the fact that you have noticed something

Ah!This is a waste of time! 啊，真是浪费时间！
Ah, I've got it. 哦，我想起来了。