valuable things offered or given to people who do not appreciate them明珠暗投，对牛弹琴，把贵重的东西送给不识货的人
柯林斯高阶英汉双解学习词典释义
N-COUNT
珍珠
A pearl is a hard round object which is shiny and creamy white in colour. Pearls grow inside the shell of an oyster and are used for making expensive jewellery.
例句
She wore a string of pearls at her throat...她戴了一串珍珠项链。I put on the pearl earrings Daddy had bought me.我戴上了爸爸给我买的珍珠耳环。
ADJ
珍珠般的
Pearl is used to describe something which looks like a pearl.
例句
...tiny pearl buttons.珍珠般的小纽扣
PHRASE
明珠暗投；对牛弹琴
If you say that someone is casting pearls before swine, you mean that they are wasting their time by offering something that is helpful or valuable to someone who does not appreciate or understand it.
例句
You do not value what should be valued, I see I was casting pearls before swine.你不重视应该重视的东西，我觉得我是在对牛弹琴。
PHRASE
精辟见解，睿智言论，妙语如珠（常指开玩笑的话）
People describe what someone says as pearls of wisdom to suggest that it is wise or helpful, often when they are joking.
例句
And what is that pearl of wisdom supposed to mean?...那番精辟见解到底是什么意思呢？Her advice includes perfectly true but rather fulsome pearls of wisdom.她的建议中有完全正确的金玉良言，但有过于恭维之嫌。
英汉词典释义
n.
珍珠
The necklace consists of three strings of pearls.这条项链由三串珍珠组成。He bought his girlfriend a pearl necklace.他给他女朋友买了一条珍珠项链。
珠状物
Pearls of dew glistened on the grass.草地上露珠晶莹剔透。
英英词典释义
Noun
1. a smooth lustrous round structure inside the shell of a clam or oyster; much valued as a jewel
2. a shade of white the color of bleached bones
3. a shape that is small and round;
"he studied the shapes of low-viscosity drops""beads of sweat on his forehead"