这并不是俄国人第一次发现黑龙江(一种说法是黑龙江是世界第六长的河，超过湄公河和刚果河的长度，流域面积超过长江)。
It was not the first time that Russians had stumbled on the Amur, by some measures the world's sixth-longest river, longer than the Mekong or the Congo and draining a basin bigger than the Yangzi's.
这并不是俄国人第一次发现黑龙江(一种说法是黑龙江是世界第六长的河，超过湄公河和刚果河的长度，流域面积超过长江)。
It was not the first time that Russians had stumbled on the Amur, by some measures the world's sixth-longest river, longer than the Mekong or the Congo and draining a basin bigger than the Yangzi's.
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