Cast pearls before swine.
1. 对牛弹琴。
习惯用语cast pearls before swine1.■把珍珠丢在猪面前; 明珠暗投; 对牛弹琴He who would search for pearls must dive below.1.■欲寻珍珠就要潜到水里; 不入虎穴, 焉得虎子。P-Harbor1.■珍珠港(美国军港)2.■(珍珠港事件式的)偷袭P-River1.■珠江2.■美国密西西比州中部的一条河流特殊用法glass pearls1.■玻璃珠oriental pearl1.■东方珍珠porcelain pearl1.■瓷制珍珠