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As China's major planting base for rubber trees 《中国科学院院刊(英文版)》2008,22(1):19-20
As China＇s major planting base for rubber trees （Hevea brasiliensis）,Xishuangbanna in southwest China＇s Yunnan Province has made tremendous contributions to the national economic growth. However, because the lands suitable for rubber plantations are largely distributed in tropical rainforests,the increasing rubber plantations have led to the acreage reduction of the local rainforests. These may irreversibly alternate the local ecological and environment systems, producing direct or indirect impact on climate. Of them, the changes in atmospheric chemistry are caused by the differences between biogenic volatile organic compounds （VOC） from rubber plantations and those of natural vegetation. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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WANG Yan-lei HAO Qing-duo OU Jin-ping 《重庆大学学报(英文版)》2007,6(3):221-226
In-plane shear properties of composite material laminates are very important in structural design of composite material. Four commonly used in-plane shear test methods were introduced in this paper. In order to study the differences of various shear test methods, two ASTM standard in-plane shear test methods for composite material laminates were experimentally investigated. They are ±45° tensile shear test (ASTM D3518) and V-notched rail shear test (ASTM D7078). Five types of composite material laminates composed of E-glass fiber fabric and vinyl ester resin were utilized, whose stacking sequences are 03s, 0/903s, CSM/0/902s, ±453s and (0/90)2/(±45)2/(0/90)2s, respectively. The test results indicate that the ±45° tensile shear test can predict shear moduli of composite material laminates accurately. However, the predictions of shear strength using ±45° tensile shear test are significantly lower than those of V-notched rail shear test. 相似文献
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However的主要句法功能是起句际衔接的作用,可位于句首、句中或句尾。从焦点结构来看,however的位置变化虽然不影响其所在句子的命题意义,却附加有不同的语用意义,标示着不同的信息焦点。 相似文献
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李晓劲 《读与写:教育教学刊》2008,5(6)
Public speaking, as one kind of speech act, the speaker uses some pragmatic strategies, for example,the use of personal pronoun, in order to achieve effective communication. Speakers use the first personal pro-noun we and the second personal pronoun you conventionally, also there are some deviations in the use of person-al pronouns. However, theses kinds of uses have to be explained and understood in such a specific context. 相似文献
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郭萍利 《商情·科学教育家》2008,(2)
With the continual reform of language teaching and learning methods.teachers are in great demand to organize the classes in English and create English-learning circumstances.However,with the limitation of students vocabulary,teachers have to simplify their teaching hnguage with the help of facial expressions and body movements.In this article,the possibility and the effect of using body language in listening,speaking,reading and writing will be further discussed. 相似文献
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