What does it mean to hide pearls secretly?

Used to describe a good thing that is not superficial, but good at discovery.

Idiom is a major feature of traditional culture in China, which has a fixed structure and a fixed sentence, indicating a certain meaning. It is applied to a sentence as a whole, with subject, object, attribute and other components. A large part of idioms are passed down from ancient times and represent a story or allusion. Some idioms are just a miniature sentence. Idiom is a ready-made word, similar to idioms and proverbs, but slightly different.

Idiom is a fixed phrase formed by long-term use and tempering in Chinese. It is a language unit with richer meaning and grammatical function equivalent to words, with rich and profound ideological connotation, short and pithy, and easy to remember and use. Often accompanied by feelings, there are derogatory meanings and justice, and of course there are neutrals.