Yellow ears send books: yellow ears: dog names; Books: Letters. Huang Er sent a home letter to his master.

Send a goose to send a book: it refers to delivering a letter.

Jiang Gan Steals Books: Jiang Gan, the Character in Romance of the Three Kingdoms. Jiang Gan stole the letters and went back to Cao Ying to kill his general. Metaphor is the intrigue of others.

Yin Xin: A letter sent to or from a distant place.

To take the liberty of speaking is an insult to listening: listening is a tribute to the listener. Modesty, which is common in letters, means that you are straightforward. Please forgive me for adopting it.

Eye-broken scale hanging: scale hanging: fish and goose are metaphors of letters.

Letter from Peace: A letter reporting the safety of family members.

Jade bird messenger: refers to the messenger who delivers letters.

Books are not enough: a book is a letter. It is difficult to fully express its meaning in the letter. Later, it was often used as an idiom at the end of a letter.

This book is not full of meaning: it means that words can't fully convey meaning.

Books are not full of words, and words are not full of meaning: books are letters. It is difficult to fully express their meaning in letters. It means that language and words are not easy to express ideas completely and accurately.

Stop the clouds and set the moon: to express the memory of relatives and friends (formerly used for letters).

Words fail to convey the meaning: the feelings are far-reaching, and words are difficult to express completely. It is often used at the end of a letter, indicating that the word does not express all the meaning.

Goose to fish: corresponding. Goose and fish are metaphors of letters.

Goose fish note: refers to letters.

Send books by goose feet: geese: geese; Books: Letters. Goose can deliver letters.

Wild goose feet leave books: wild goose: wild goose; Books: Letters. Goose can deliver letters.