终有小成

某人刻苦学习英语，终有小成。

一日上街不慎与一老外相撞，忙说：I am sorry.
老外应道：I am sorry too.
某人听后又道：I am sorry three.
老外不解，问：What are you sorry for?
某人无奈，道：I am sorry five.

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