前一天；前一日
先理解核心含义，再看它在真实句子里的用法。
前一天；前一日；前一天；前一日
the day before the one being referred to; the day immediately before a particular day.
They had finished the work the previous day.
他们前一天已经完成了工作。
前一天；前一日
the day before the one being referred to; the day immediately before a particular day.
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Dictionary facts from AI_SUPPLEMENT.