红头潜鸭在二十世纪九十年代末被认为已灭绝。
二十世纪九十年代末，我国正式将教育界定为第三产业，教育作为一种服务的观念得以确立。
At the end of 1990' s, education was officially designated to the brovince of the third industry, which forms the idea that education is a kind of service.
二十世纪九十年代末，我国正式将教育界定为第三产业，教育作为一种服务的观念得以确立。
At the end of 1990' s, education was officially designated to the brovince of the third industry, which forms the idea that education is a kind of service.
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