yes·ter·day /ˈjɛstɚ/
 昨天,昨日(ad.)昨天,昨日


 Yes·ter·day, adv. On the day last past; on the day preceding to-day; as, the affair took place yesterday.

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 Yes·ter·day n.
 1. The day last past; the day next before the present.
 All our yesterdays have lighted fools
 The way to dusty death.   --Shak.
    We are but of yesterday, and know nothing.   --Job viii. 9.
 2. Fig.: A recent time; time not long past.
    The proudest royal houses are but of yesterday, when compared with the line of supreme pontiffs.   --Macaulay.


 yesterday
      n 1: the day immediately before today; "it was in yesterday's
           newspapers"
      2: the recent past; "yesterday's solutions are not good
         enough"; "we shared many yesterdays"
      adv 1: on the day preceding today; "yesterday the weather was
             beautiful"
      2: in the recent past; only a short time ago; "I was not born
         yesterday!"