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.
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, traditional linguists had just described the meanings of a preposition and had not analyzed them generally and systematically.
长期以来，传统语言学家只是对介词的语义进行描述，而没有对其进行全面系统的分析。
The words of time in the book A Dream in Red Mansions (the first 80 charpters) can be integrated with the time words, numeral, adverb, pronoun, preposition, direction words etc.
《红楼梦》时间词可以和时间词、数词、副词、代词、介词、方位词等组合；
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