日复一日
word C2- day after day
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经过日复一日、年复一年的潜心研究，竹子的每一个细节都深深印在了他的脑海中。
追求渊博的学识就像是打磨这根铁杵，需要日复一日的沉淀，绝不能因为眼前的困难而半途而废。
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