求翻译：We got there at nine o’clock. Mr. Zhu divided us into three groups and then we began working. Group One was responsible to plant trees and water flowers. Group Two were busy collecting litter left by the tourists. I was in Group Three. We went to the children’s playground and cleaned all the equipment there. We worked very hard. At about eleven we finished work. We all were tired but very happy. I will never forget the day in my memory.是什么意思？

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