Pollution, commercial fishing, coastal erosion, development and poaching are among the causes.
污染, 商业捕捞, 海岸侵蚀, 偷猎等都是造成这种状况的原因.
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Aral Sea supported a thriving commercial fishing industry employing roughly 60,000 people in the early 1960 s.
咸海扶持了兴旺的商业捕鱼业.1960年代大概有6万人从事这一行业.
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