The paper focuses on the degrees of acquisition of marginal prepositions, and deeply explores causes why learners have difficulties in acquiring these prepositions.
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。
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.
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。
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