He explained the beauty of the music to her but it was just casting pearls before swine.

他跟她讲解那音乐的美妙之处, 但这只不过是对牛弹琴而已。

She decided not to buy the most expensive wine for dinner, thinking that would be casting pearls before swine.

她决定宴请时不买最贵的酒，心想反正他们也不识货。