In this paper, We give two equivalent statements of relative essentialextension.
本文给出相对本性扩张的两个等价条件。
2
The modernity of Chinese prose theories is, in one sense, an essentialextension of the modernity of modern Chinese culture.
中国散文理论的现代性，在某种意义上就是中国文化现代性的必要延伸。
3
The elective part aims to provide an in-depth treatment of some topics, an application of essential knowledge and concepts, or an extension of certain areas of study.