cast pearls before swineWiktionary 原文词源说明From the Bible: "Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you." – KJV, Matthew 7:6.释义（英文）动词 Verb(idiomatic) To give things of value to those who will not understand or appreciate them.词族派生词（1）pearls before swine