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Abstract: Beginning with the concept of public forests, this paper summarized the current situation, theory methods, representative evaluation and quantization models which are currently used in the research of ecological benefits evaluation and quantizat
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文摘:从公益林的概念入手，以生态学和经济学为理论依据，概述了目前国内外公益林效益计量评价的研究现状、理论基础、评价方法及典型计量评价模型，并对公益林效益计量评价中存在的问题以及今后的发展趋势进行了分析。 |
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Abstract: Beginning with the present situation of population explosion and the severe way of human bearing,this article concludes that the restriction of regeneration and the control to turn human seciety into sustainable development track;that the reprod
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文摘:从严峻的人口形势和生育方式的现状论述了节制生育、控制人口恶性膨胀是人类转入可持续发展轨道的首要条件，生殖调节成为生殖健康的核心问题，提出改进生育方式是21世纪的医学面临的一项重大挑战。 |
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Abstract: Being moderately well-off is a new phase for residents' consumption.
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文摘:居民消费由温饱到小康标志着消费进入一个新阶段。 |
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Abstract: Benzotriazole is a good corrosion preventive compound that can reacts with aldehyde and alcohol.The addition reaction is used to synthesize eight alkoxyalkyl benzotriazoles by benzotriazole,propionaldehyde and methanol,ethanol,propanol,iso-propy
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文摘:利用苯骈三氮唑、丙醛分别和甲醇、乙醇、丙醇-1、丙醇-2、丁醇-1、丁醇-2、2-甲基丙醇-1、2-甲基丁醇-2反应合成了八种烷氧基烷基苯骈三氮唑，通过元素分析、IR、1HNMR对上述化合物的结构进行了测定，并讨论了这类加成反应的历程。 |
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Abstract: Besides the heat, the death-cause in building fire is mostly due to the tox ic ity of the fire smoke.
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文摘:建筑火灾中致人死亡的因素除了热以外，更多的是因为烟气的毒性。 |
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Abstract: Better understanding of the immunological mechanisms implying the insemination and the infertility of some men and women is needed and crucial to the development of an effective immunocontraceptive method.
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文摘:更好地理解隐含在受精和某些男女不孕中的免疫学机制对于开发有效的免疫避孕方法是必须而且是至关重要的。 |
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Abstract: Between 1405 and 1433, Zheng He commanded seven enormous oceangoing expeditions which brought Chinese influence and ideas to the coastal peoples of Asia, India, Arabia and Africa.
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提要：1405~1433年间，郑和率船队七下西洋，将中国的影响和理念带给东南亚、印度、阿拉伯和非洲沿海的人民。 |
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Abstract: Both in the Industrial Society when it had seen a great prosperity of traditional industry, and in the Post-Industrial Society when it managed to go through the difficulties of industrial restructuring, the Ruhr Area is always a highlight all ov
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摘要：无论在工业社会背景下的传统工业繁荣时期，还是在后工业社会背景下的工业结构转型时期，鲁尔区都因其成功的区域发展和独特的区域特性而引起世人的广泛关注。 |
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Abstract: Both the traditional Chinese garden and 18th century English landscape garden attach importance to natural beauty, but their environmental scenes are often very different.
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摘要:中国传统园林和18世纪英国风景园都注重自然美，但环境景观却常呈现明显差异。 |
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Abstract: Breast cancer exhibits familial aggregation, consistent with ariation in genetic susceptibility to the disease.
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摘要：乳腺癌显示家族聚集性，以及对这种疾病易感基因变异的一致性。 |
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Abstract: Breast cancer exhibits familial aggregation, consistent with variation in genetic susceptibility to the disease.
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摘要：乳腺癌显示家族聚集性，以及对这种疾病易感基因变异的一致性。 |
