What can you think of an impromptu comment on the fragrance outside the wall?

The flowers planted in the wall are unremarkable in the high wall. People in the wall regard it as an ordinary variety, but it doesn't feel fragrant after soaking, but the fragrance floats outside the wall, giving people a good feeling and yearning. In other words, talents or technological inventions are not valued by local people, but are widely known elsewhere. People have made achievements, but they don't know much about them internally. Outsiders have heard and appreciated them. Metaphorical achievements are not valued by this department, but appreciated by other departments.

Idiom:

Idioms are stereotypes in Chinese vocabulary. Idioms, everyone says they have become words, and so do idioms. Idioms are mostly four-character, and some are three-character, five-character or even more than seven-character. 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.