图形-背景论源于心理学，后由认知语言学家用来研究语言结构的意义，尤其是介词的意义。
Figure-ground theory derives from psychology and is used by cognitive linguists to analyze the meaning of linguistic structures, that of prepositions in particular.
这个星期的课堂主题是介词。
This week the class has been covering the topic of prepositions.
英语是介词的语言。
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