野外调查和资料分析显示，陕北黄土高原土壤干化原因有两个方面：一是自然原因；二是人为原因。
The field survey and the data analysis show that the cause of soil drying in the Loess Plateau of northern Shannxi has two aspects: natural causes and anthropogenic causes.
阶段1，阶段2和阶段3沉积速率的加速是由自然原因造成的；阶段4和阶段5沉积速率的加速则是由自然和人为原因共同造成的。
Stages 1, 2, and 3 occurred due to natural environmental changes, and stages 4 and 5 was due to the joint influence of both natural and human factors.
鹰本身就是飞翔在大自然的蓝天里，可因自然原因和人为原因受到病魔灾害。
The eagle is itself in the nature of the blue sky fly in, but because of natural causes and human factors disease by disasters.
鹰本身就是飞翔在大自然的蓝天里，可因自然原因和人为原因受到病魔灾害。
The eagle is itself in the nature of the blue sky fly in, but because of natural causes and human factors disease by disasters.
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