usually very active classroom atmosphere
...很单纯， We laughed at that time, the moment we are simple, 通常课堂气氛很活跃 Usually very active classroom atmosphere 一个飞机在地上 An aircraft on the ground ..
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usually very active classroom atmosphere
课堂气氛通常很活跃
以上为机器翻译结果，长、整句建议使用 人工翻译 。