He is not a computer expert; you don't need to cast pearls before swine.
他不是计算机专家，你不必对牛弹琴。
To cast pearls before swine is to give things of value to those who will not understand it.
明珠投暗的意思，就是把珍贵的东西送给不识货的人。
I won't waste good advice on John anymore because he never listens to it. I won't cast pearls before swine.
我再也不会给约翰提建议了，因为他根本听不进去。我可不想对牛弹琴。
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