作家苏珊·尤因在《伟大的阿拉斯加自然概况》中写道，“鲑鱼从阿拉斯加涌出，就如同血液从心脏流出，给土地、动物和人类带来了节奏，传递了营养。”
"Salmon," notes writer Susan Ewing in The Great Alaska Nature Factbook, "pump through Alaska like blood through a heart, bringing rhythmic, circulating nourishment to land, animals and people".
第二部分，主要介绍了研究区的自然概况和污染状况。
The second chapter mainly introduces the physical and pollution situation in the study area.
从黑龙江省西部半干旱地区自然概况及河滩地经营现状出发。
According to the natural conditions and the management situation of the flood land of the west semi-arid Area of Heilongjiang province.
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