後悔先に立たず。
/ してしまったことは取り消すことはできない。 - ウィリアム・シェイクスピア (1564 - 1616): 『マクベス』
/ 馬が盗まれてから馬屋に鍵をおろしても遅すぎる。
/ なくして初めてその価値がわかる。
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What is done can't be undone. - William Shakespeare (1564 - 1616): Macbeth
/ It is too late to lock the stable when the horse has been stolen.
/ A good thing is known when it is lost.
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