In the modern philosophy of science and technology Dialectics of Nature is beyond assimilation with other subject because of its wide visual field, abundant contents and perfect system and structure.

在现代世界科学哲学和技术哲学中，自然辩证法视野之广阔，内容之丰富，体系结构之完善，都是其他同类学科无法比拟的。

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Based on these, some problems were brought forward about land science subject nature, special research system, and theoretical bases.

在此基础上，探讨了土地科学学科性质、研究对象、理论基础等问题。

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Its research subject is tourism ecosystem which is a compound ecological system of society, economy and nature.

旅游生态学的主要研究对象是旅游生态系统，旅游生态系统是一个社会—经济—自然复合生态系统。

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"Incidents of this nature on the Metro system are rare, but when they do occur they are subject to thorough and independent scrutiny, " a spokesman said.

BBC: Metro train dragged woman by the arm - report