This is an informal introduction to some interactions between mathematics and physics, entered around the generalizations of derivatives.
这是一篇关于数学和物理中以导数的推广为中心交流的非正式介绍文章。
This is quite an informal style of introduction.
这是十分不正式的介绍用语。
The first part is the introduction, introduces the background of putting forward the problem and the original theories of the informal employment.
第一部分非正规就业概述，介绍了问题的提出背景以及非正规就业的理论渊源。
The first part is the introduction, introduces the background of putting forward the problem and the original theories of the informal employment.
第一部分非正规就业概述，介绍了问题的提出背景以及非正规就业的理论渊源。
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