求翻译：最早出现的职业指导理论模式是由美国波士顿大学教授帕森斯（F.parsons）提出，由威廉逊（E.G.Williamson）发展成型的“特性是什么意思？

First theoretical models of vocational guidance is for the United States at Boston University Professor Parsons (F.parsons) made from weilianxun (E.G.Williamson) development forming "features-factor" theory (Trait-Factor Theory). The theory is based on major differences to personality psychology and psychology, that everyone has their own unique ability to model and personality characteristics, and mode of a certain ability and personality pattern and correlation with specific career there. Therefore, the method of analysis used in guidance work, research work on the professional requirements of tasks and the working environment for staff, to seek professional matches in person do "make", "his vocation", "only to do with it" [1]. But in order to "make" and occupational factors and characteristics of human quality rigid matching theory, there are limitations of its own, on the one hand: people as a whole, between personality characteristics are interrelated, hard to say what kind of personality characteristics and some kind of career-related, professional match description cannot be more people. Second, human personality quality difficult to objectively measure, and thus difficult to precise analysis based on the quality of the human personality and form a "rigid" matching modes.