在此基础上，指出创建农村灾害经济学具有客观必然性。
Based on the, pointed out that it is necessary to establish rural catastrophe economics.
差异化教学理念的产生具有深刻的客观背景和历史必然性。
Emergence of the idea of different teachings has deep objective background and historic necessity.
关于这一问题的提出，除了具有一定的客观必然性外，问题的广泛性也显示出了其与众不同的研究价值。
On this issue, suggested that in addition has a certain objective necessity, the issue also shows the breadth of its unique research value.
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