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This project was conducted starting with the three interrelated subjects the structural characteristics of desertification landscapes in different bioclimatic zones, desertification driving factors and their function mechanism, and the dynamic model of landscape space for the occurrence and development of desertification in representative desertification regions and on the basis of in-depth studies of the relations between landscape structural characteristics and processes of desertification and their stability; the driving force of different time-space scales of desertification and their proportion, manifestation form, and action mechanism in the desertification processes; and the establishment of threshold conditions for the surface wind erosion and has achieved important progress in the definition of desertification conception

本课题从三个相互联系的专题(即不同生物气候区荒漠化景观的结构特征、荒漠化驱动因素及其作用机理、典型荒漠化地区荒漠化发生与发展的景观空间动力学模型)入手,在深入研究荒漠化景观结构特征与过程的关系及其稳定性,不同时空尺度的荒漠化过程驱动力及其在荒漠化过程中所占比重、表现形式及作用机制,地表风蚀临界条件的确定等内容的基础上,虽未建立荒漠化景观空间动力学模型,但在沙漠化概念,次间冰期以来沙漠化过程时间序列和特征冷暖时期沙漠、沙地空间分布格局,现代沙漠化过程中自然因素和人文因素的作用、贡献率、沙漠化土地对气候的反馈作用以及风蚀临界值,沙粒跃移轨迹参数和能量分布,我国沙漠化防治思路和对策,沙尘暴区划和沙尘暴指数等方面取得了重要进展。

The pinnate division of a pinna in a bipinnately compound leaf, or the ultimate divisions of a leaf which is more than twice pinnately compound.

小羽片 Pinnule 二回或二回以上羽状复叶的级羽片。

The taxa examined, all of which have simple leaves with entire margins and camptodromous pinnate venation, varied in their secondary venation, which was brochidodromous or brochidodromous to eucamptodromous, the m...

结果表明:含笑属、合果木属Paramichelia和观光木属Tsoongiodendron植物的脉序类型、一级脉、二级脉及其间脉和三级脉等特征表现出较高的一致性,三属间无明显的划分界限;但是,盲脉及其分支、网眼的发育和大小、叶缘级脉等叶结构特征存在种间差异。

Bis-(4′-bromobenzoyl)benzene was synthesized from terephthaloyl chloride and bromobenzene using aluminum chloride as a catalyst.

以对苯二甲酰氯和溴苯为原料,无水氯化铝粉为催化剂,合成了1,4-双(4′-溴苯酰基)苯,其结构经1HNMR,IR和DSC表征。

Last 48h after antigen to stimulate the collection of blood, bronchoalveolar lavage fluid and bone marrow specimens.

次抗原激发后48h收集血、支气管肺泡灌洗液和骨髓标本。

Medicine Woman IV focuses on the ultimate Mayan mystery; the MAYAN CALANDER which stops on the 21st December 2012 with the prophecy that humanity will cross the threshold into a new era and will make some kind of very profound change after years of turmoil.

巫婆医IV偏重于解开玛雅之谜;玛雅挂历停泊在2012年12月21号的预言,人类将跨越而步入一个新的时代,并颠多年的动乱后,将使某种很是深刻的变化。

The method makes model of small rat gastric ulcer, go alone with the home stomach of fill of colza leach fluid gives drug, observation test group and contrast the cankerous index of mucous membrane of group of small rat stomach, discuss its to advance a law to observe the home goes alone with charcoal end to protective action; of the stomach the influence that colza water steep moves to small intestine passes experiment leaving put oneself in another's position to observe its the action; of flowing to small rat small intestine flesh observes with heating up board law the home goes alone colza water.

方法制作小鼠胃溃疡模型,以家独行菜子水浸液灌胃给药,观察实验组和对照组小鼠胃黏膜的溃疡指数,探索其对胃的保护功能;以炭推进法观察家独行菜子水浸液对小肠运动的影响并通过离体实验观察其对小鼠小肠平滑肌的功能;以热板法观察家独行菜子水浸液对实验动物的镇痛功能。

Methods The effect of Magnolol on the propulsion of carbo medicinalis in small intestine in the mice given Rhubarb was observed.

观察厚朴酚对生大黄小鼠小肠炭推进的影响及对番泻叶与蓖麻油引起小鼠腹泻模型的止泻作用。

In my case I used to go to Cuba every year in the late 1980s and could imagine I had a whole island to myself; the only other tourists I'd see along its languorous, mostly carless streets were a few pasty-faced Bulgarians, some North Koreans with badges of their Great Leaders on their hearts, and Soviets delightedly lining up at the breakfast buffet of the old Hotel Nacional (with its hand-operated iron elevators), hardly caring that the only peaches served in this tropical place came from cans.

拿我自己来说吧,20世纪80年代,我每年都去古巴,还能幻想自己独享整个岛屿,沿着古巴那懒懒散散、几乎没有汽车的街道,我所能见到的其他旅游者只有几个脸色苍白的保加利亚人、几个胸前戴着他们&伟大领袖&徽章的朝鲜人,以及欣喜地在老&古巴国宾馆&自助早餐前排队的前苏联人(宾馆还是人工操作的电梯),他们几乎不介意这个热带国家提供的惟一水果是桃罐头。

All these studies put scientific basic for rational management for sustainable coastal protection forest of Casuarina equisetifolia, and meet the demand of the construction of coastal prevent system project.

虽然国外大量的研究表明,细根在森林生态系统的物质循环和能量流动中发挥着巨大的作用,但我国对林木细根的研究还是停留在国外20世纪70年代、80年代初的水平上,对细根在森林生态系统中的主要作用认识不足。

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推荐网络例句

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。