大脑的结构和功能是自然科学研究中最具有挑战性的课题。

The structure and function of brain are the most difficult problems in natural science research.

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我们知道，理想方法是自然科学研究中一种常用的科学抽象方法。

As we have known, the method of idealization is a common-used scientific abstract method in the research of natural science.

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指导、协调全市各地、各部门的科技管理工作；审核自然科学研究机构的组建和调整。

To guide and coordinate the technical administration of parts and departments of the city; to review the organizing and adjustment of natural science research institutions.

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So this diet, although it's processed by a company and sold for people doing animal studies, it more or less mimics what these animals might be eating under natural conditions.

尽管这些食物经过商业加工,并用于动物科学研究,但会尽可能的模拟,实验动物在自然环境下的饮食

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选