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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这是地球上最后一片原始的水生态系统，决不能被摧毁。
This is the last pristine Marine system on Earth and it could get destroyed.
研究了电厂热排水对水生生态系统的影响。
Effects of thermal discharge from power plant were studied.
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