It may come as a surprise to many an exhausted mother or father--but thinking about your children could improve your memory,a study suggests.
这里的 an 和 but 要怎么理解?
many a(n) + 单数名词 = many +复数名词。前者为古体用法,现在使用则显得过于正式。
but 为并列连词,后接并列分句,thinking about your children为动名词短语作后一分句的主语。
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