考研英语写作语言素材-英语谚语佳句39

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Not to know what happened before one was born is always to be a child.
    不懂世故，幼稚可笑。
    No way is impossible to courage.
    勇者无惧。
    Obedience is the first duty of a soldier.
    军人以服从命令为天职。
    Observation is the best teacher.
    观察是最好的老师。
    Offense is the best defense.
    进攻是最好的防御。
    Old friends and old wines are best.
    陈酒味醇，老友情深。
    Old sin makes new shame.
    一失足成千古恨。
    Once a man and twice a child.
    一次老，两次小。