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牛群踏出了一條通往池塘的小徑.The cattle had trodden a path to the pond.羊在草地上踏出了一條小徑.The sheep trod a path through the grass.老師一踏出教室,教室里的蠢舉就接二連三的.There was a lot of tomfoolery in the class when the teacher stepped out....