交通运输系统是人类生活、社会经济活动的重要组成部分。
Transport system is an important part of human life and socioeconomic activities.
这是因为淡水生态系统和人类活动密切相关。
That's because freshwater ecosystems are so closely linked to human activity.
这是因为淡水生态系统和人类活动密切相关。
That's because freshwater ecosystems are so closely linked to human activity.
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