边缘介词在最近几年的语言学研究中日益受到关注，但重点皆放在普通的定义，分类等方面。
In recent years, marginal prepositions are increasingly paid attention to in the linguistic studies, but the emphases are on the general definition and classification of them.
本文则以边缘介词的习得程度为切入点，从深层次剖析学习者为什么对这一类介词的学习存在困难。
The paper focuses on the degrees of acquisition of marginal prepositions, and deeply explores causes why learners have difficulties in acquiring these prepositions.
长期以来，英语中的边缘介词，由于其边缘性，未引起语言研究者的充分重视，但却是语言教学中的一个难点。
For a long time marginal preposition in English has been receiving little attention because of their marginal nature, but it is a difficult point in language teaching.
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