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for a long time
I have been knocking away for ages,but nobody has answered the door.
我已经敲了门好久，但是没人答应。
I haven't eaten meat for ages.
我已经好久没吃肉了。
A:Hi,Lily,I haven't seen you for ages,how have you been?
嗨莉莉，我已经好久没见到你了，最近怎么样?
B:Well,good,you?
很好，你呢?
A:I'm doing pretty well.
我非常好。