at one's fingers' ends
介词短语
英文释义
介词短语
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Synonym of at one's fingertips.
— The more business he got, the greater his power seemed to grow of getting at its pith and marrow; and however late at night he sat carousing with Sydney Carton, he always had his points at his fingers' ends in the morning.
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数据来源: Wiktionary