"Zai" means "to locate",having the function to make the subject connected with time or space.Both the adverbial and adjective "zai" can mean continuous actions."Zheng" emphasizes that how precise is the matching."Zheng" and "zai" can be used in many different combinations,but their own meanings are not changed and they are making their own functions.%"在"的意义是"位于",其功能是使主体与"在"后接的场所、活动产生空间或时间上的关系。副词"在"和介词"在"都能表示进行。"正"强调匹配的精确度,可与"在"构成多种组合。在这些组合中,"正"和"在"没有发生语义上的根本改变,并发挥着各自的功能。
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