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by是什麼時態的標誌詞

  All the statistical computations were performed by the new software system.

  所有的'統計計算均由新的軟體系統完成。

  They won by a single goal after extra time.

  他們在加時賽中僅踢進一球即獲勝。

  They've increased the price by 50%.

  他們已經把價格提高了50%。

  Now I can walk to work instead of going by car.

  現在我可以步行去上班,而不必開車了。

  I'm always broke by the end of the month.

  我總是一到月底就沒錢花了。