以下为句子列表：
英文: Seasonal variation of the composition of the nekton group was obvious, but for the demersal fishes and the pelagic fishes, their species composition varied with time.
中文: 游泳生物组成的季节变化明显 ,但对于鱼类的底栖类群和中上层类群则存在着时间上的差异
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英文: Changes of demersal fish community structure in the Yellow Sea during the autumn
中文: 秋季黄海底层鱼类群落结构的变化
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英文: Community structure and diversity of demersal fish in the middle reaches of Heilongjiang River,Northeast China
中文: 黑龙江中游底层鱼类群落结构及多样性
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