求翻译：从职业指导的发展历史来看，最初并无任何理论可循。是先有实际的工作，而后才逐渐由实践经验中，抽演出若干基本原则与假设，再加以验证与总结，进而便有理论的确立。二次大战后，社会学家和职业指导工作者广泛运用心理学的原理和方法研究职业问题，职业指导的理论趋于系统化和多样化。本文选取西方比较有代表性的几种职业指导理论来考察职业指导的目标、功能、过程的大致发展趋势。是什么意思？

Judging from the history of the development of vocational guidance, initially did not have any theory to follow. Is the first real work, which only began to experience, performed a number of basic principles and assumptions, and then be validated and summary, which will have an establishment of theory. After the second world war, sociologists and occupational guidance workers extensive study on the application of psychological principles and methods of professional issues, vocational guidance theory tends to systematic and diversified. Select Western comparison in this article are representative of several vocational guidance theory to study the broad objectives of vocational guidance, functional, process development.