嚴春林 的英文怎麼說
中文拼音 [yánchūnlīn]
嚴春林
英文
chunlin yan-
Therefore, the situations and approach planting trees in and around the city from china and other countries have been studied ? the situation in taiyuan city likes this : it is an arid and water shortage region is longer in winter and is windy and sandy in spring also there are serious air pollution and weak municipal infrastructures and smaller urban district area, but the history is very long
結合太原實際，並針對乾旱缺水、冬季時間較長、春季風沙較大、空氣污染嚴重、歷史文化悠久、基礎設施薄弱、市區面積偏小的狀況，提山了太原生態園林城市建設的總體框架和實現途徑。In the late 30 or 40 years, many scholars have a lot of studies on a seemingly unrelated regression ( sdr ) system with two linear regression models, and some important results are obtained : zellner ( 1962 ) put forward two - stage estimator ( tse ) ; based on zellner " s, lin chun - shi ( 1984 ) obtained the sufficient and necessary condition of two - stage estimator ; chen chang - hua ( 1986 ) discussed the tse and its optimalities without any condition for designed - matrix x ; ulteriorly, wang song - gui and van li - qing ( 1997 ) obtained an iteration sequence of estimator by using the covariance - improved approach ; liu jin - shan ( 1994 ), li wen and lin ju - gan ( 1997 ) generalized the covariance - improved estimator respectively
半相依回歸系統是由兩個誤差項相關的線性回歸方程組成的系統。近三、四十年來，已有很多的學者對這類半相依回歸系統進行了大量的研究，作出了十分重要的成果： zellner （ 1962 ）提出了所謂兩步估計法；在其基礎上，林春士（ 1984 ）得出了兩步估計的充要條件，陳昌華（ 1986 ）討論了對設計矩陣不作任何要求的兩步估計及其優良性；進一步地，王松貴、嚴利清（ 1997 ）利用協方差改進法獲得了參數的一個迭代估計序列，劉金山（ 1994 ） ，李文、林舉干（ 1997 ）則分別對協方差改進估計進行了推廣。Forest fires hit northeast china and the provinces of yunnan, shanxi and hebei this spring, making 2006 the worst year for forest fires since 1988
今年春季東北、雲南、山西、河北等地發生了嚴重的森林火災，是1988年以來最嚴重的年份。
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