We never know the value of water till the well is dry
判断一个人，不听言语看行动 We never know the value of water till the well is dry。井干方知水可贵 We only live once，but if we work it right，once is enough。年华没虚度，一生也足矣。
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We never know the worth of water till the well is dry
We never know the worth of water till the well is dry：井干方知水可贵 written in water：(名声、成就)转眼即逝的；昙花一现的 ..
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