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天黑了,小朋友们早已放学回家了,老师们也下班了。突然,办公室里传出唉声叹气的声音,原来是作业本上的字母们在诉说自己的烦恼。
It was dark, the children had already come home from school, and the teachers also got off work. Suddenly, the voice of moaning and sighs came from the office. The original letters of the homework were telling their own troubles.