According to relevant research and investigation, the declining tendency inthe growth of urban afforestation tree is largely due to soil quality in city.
在调查和研究中，我们发现，城市绿化树生长势衰弱的状态主要和城市土壤性质相关。
According to the relevant research, the originate of this system can be trace back to north and south dynasties mortgages system.
根据相关的考证可以看出，该制度可能源起于南北朝时期的典卖制度。
Developes emergency repairing decision support system software frame of urban gas pipeline accident according to previous research results and the relevant models by the use of VB6.0.
根据前面得到的研究成果和相关模型，利用VB 6.0构建起了城市燃气管网事故应急抢修决策支持系统的软件框架。
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