Up to now, all theoretical research on natural resources and their exploitation and utilization are based on the basic knowledge of "natural resources are useful natural substance and energy".
迄今为止，所有关于自然资源的理论研究与开发利用都是建立在“自然资源是有用的自然物质和能量”这一基本认知之上的。
The substance of Keynesia doctrine is that demand is below theoretical and expansionism financial policy view.
凯恩斯主义的实质是需求不足理论和扩张性财政政策主张。
The article has described substance, theoretical basis and applied range of semisolid die forging, and it has introduced some applied examples.
叙述半固态模锻的实质、理论基础及应用范围，介绍了半固态模锻的应用举例。
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