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Results are as following:The causes of grassland desertification of Hulunbeir are the outcome of interaction of nature and the human beings. Among these reasons, the loose soil texture, which was formed in the fluviolacustrine sediment during Quaternary, establish the physical ground, and the drought and wind is the natural force of grassland desertification. And then over-cutting forest, over-grazing grassland, imbalance of resource utilization and estrepement reduce the coverage of vegetation, therefore provide necessary conditions for the grassland desertification.

其中,形成于第四纪河湖相沉积沙的疏松土壤母质,为日后土壤风蚀奠定了深厚的物质基础;干旱多风的气候条件构成了草地风蚀沙化的自然营运力;而人为过度砍伐沙地林木资源、沙质草地长期超载放牧、资源利用不平衡以及乱垦、滥挖等不合理经济行为,又降低了沙化草地植被覆盖度,为草地风蚀沙化提供了必要条件。

All this has radically changed with the introduction of "modern" modes of life such as the Dutch pelt traders during the 17th and 18th centuries that resulted in the near extinction of the Sika Deer, the subsequent large-scale import of Chinese farmers to open and work rice and sugar plantations, the exploitation of camphor trees by the Qing and Japanese governments, and of course the horribly exploitative and short-sighted logging of two and three thousand year old trees, first by the Japanese, and then even more insidiously by the Chinese through the later decades of the twentieth century.

所有这一切却因为现代生活模式的引进而改变,例如17,18世纪荷兰的毛皮商人导致梅花鹿的灭绝,随后大量的中国农民进入台湾,开垦土地种植稻米和甘蔗,清朝与日本政府大量砍伐樟树榨取樟脑,以及在二十世纪从日本殖民开始,到国民政府几十年来短视近利地对二~三千年古树滥垦滥伐。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发,分析对称连杆曲线上鲍尔点的产生条件,提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品,年生产总值3000万美元,产品价廉物美、选料上乘、质量保证,深受国内外客户的青睐

The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.

血精的原因很,以良性病变为主。