...Cast pearls before swine Source: Give not that which is holy unto the dogs, neither cast your pearls before swine, lest they trample them under their feet, and turn again and rend you. Meaning: Offer good thing to one incapable of appreciating it. I won’t waste good advice on John any more because he never listens to it. I won’t cast pearls before swine. 对牛弹琴： 对愚蠢的人讲高深的道理。
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