class origin

He is a researcher of working class origin.

他是工人出身的研究员.

The purpose of this paper is to discuss the existence and uniqueness of limit cycles for a class of plane n degree system with the origin being a stellar node.

本文讨论了原点是星形结点的一类平面n次系统的极限环的存在性和唯一性，并给出一类平面三次系统的极限环分支曲线。

This paper begins with the origin of African American vernacular English, then analyses the features of Black English, and probes into the relationship between language, race and social class.

挖掘美国黑人英语的起源有助于分析美国黑人英语的诸多特点，然后探究黑人英语与种族和社会阶层的关系。

The class origin of Pollard and other missionaries were lower levels in England;

柏格理等传教士出身于英国社会下层；

The practical research of the composition-writing training of the class F students in Guangzhou finds its origin from the problems I have encountered in the teaching of Chinese, especially that of the teaching of composition-writing teaching in my six-year teaching there in Guangzhou.

对广州市F类学生作文能力训练的实践研究源于本人在广州市第91中学执教六年来所遇到的语文教育方面、特别是作文教学方面的一些问题。

With working class origin, keen insight and his masterful description, Jack London exposes sharply the darkness of American society and severely criticizes the capitalist system.

杰克·伦敦来自工人阶层，具有敏锐的洞察力，他利用其精彩的笔触，深刻地揭露和批判了美国社会的黑暗和资本主义制度的丑恶。