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；
We use different preposition to talk about time, days, months and seasons.
我们用不动的介词来谈论时间，日，月和季节等。
We use different preposition to talk about time, days, months and seasons.
我们用不动的介词来谈论时间，日，月和季节等。
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