1、long long ago 英[lɔŋ lɔŋ əˈɡəu] 美[lɔŋ lɔŋ əˈɡo] [词典] 很久很久以前; [例句]Long long ago, there were four great inventions.很久很久以前，就有了四大发明。

2、a long time ago 英[ə lɔŋ taim əˈɡəu] 美[e lɔŋ taɪm əˈɡo] adv. 很久以前; 悠远; [例句]He must have started writing his book a long time ago.他一定很久以前就开始写这本书了。

3、long time ago 英[lɔŋ taim əˈɡəu] 美[lɔŋ taɪm əˈɡo] adv. 很久以前; [例句]In my neighbourhood, the local crack dealers would have taken him out a long time ago. 我们这片的本地毒贩早就想废了他了。

4、once upon a time 英[wʌns əˈpɔn ə taim] 美[wʌns əˈpɑn e taɪm] [词典] 从前; [例句]Once upon a time, there lived an old man who had two beautiful daughters.从前，有一个老人，他有两个美丽的女儿。

5、long long time ago 网络 很久很久以前; 潘神的迷宫; [例句]In fact this process of aging, started long long time ago, from when I just grew up to a young girl, at age18?而我的衰老，从很早的时候就已经开始了，在我还刚刚成长为少女的时候。十八岁？