Double carp refers to the ancient people who wrote letters on white silk so as not to be damaged during transmission. Tied in two pieces of bamboo slips, Jane carved it into a fish shape, hence the name. Later, it became a title for letters.
The ancient word "carp" has another symbolic meaning because of the traditional folk auspicious saying "carp jumps over the dragon gate".
"Carp jumps over the dragon gate" describes that boys in ordinary families have passed the imperial examinations and made their way to the top, just as carp that live underwater all the year round once jumped out of the water. In ancient times, children always stood at the last line in the queue where their families greeted their guests, standing in front of the back room, just like carp living under the water, so they were called "children".
The word "tong" stands from the inside, which means "standing at the innermost". Therefore, the word "li" in the two words "carp" and "tong" has the same meaning, which is why the metaphor of "carp jumping over the dragon gate" comes into being.
Extended information:
The allusion to the double carp originated from the poem "Drinking Horses in the Great Wall Cave" written by Han Yuefu. In ancient times, people used carp-shaped letters to collect books and letters, so many literati also used carp as letters in their poems. Of course, cooking fish in the poem was not really cooking, but letting their sons open carp-shaped wooden boxes with ruler.
The husband who is far away from the country can not miss him all the day, but he can see him in the dream soon. (Yesterday: Yesterday)
I dreamed that I was next to me, and suddenly I felt in a foreign land. There are different areas in the country, and the husband is wandering in the country.
withered mulberry leaves tell the wind, while sea water tells the cold. Fellow travellers home, dear, who will tell me the message of my husband?
the guest came from afar and left me a pair of carp. Call the boy to open the wooden box, with a ruler who wrote a letter.
how can I read a plain book on my knees? The first part of the letter is to increase the amount of appetite. the latter part of the letter is said to be often missed.
Interpretation:
Looking at the endless green spring grass by the river reminds people of the recruiter who travels far away. A husband who is far away from home can't miss him all day, but can only meet him in his dream. I saw him by my side in my dream, and when I woke up, I found that he was still in another country. Other townships have different areas, and husbands can't be seen wandering in other places.
Although the dead mulberry leaves are gone, it can be known that the wind is blowing, and although the vast sea water is not easy to freeze, it can also be known that the weather is getting cold. Hometown wanderers go home to their families. Dear, who will tell me my husband's message? The guests came from far away and gave me a carp-shaped wooden box with silk letters. Call the boy servant to open the wooden box, which contains a long letter written in plain silk.
respectfully read the letter written by her husband in plain silk. What did it say? The first part of the letter is about increasing your appetite and taking care of your health, while the second part of the letter tells about your thoughts.
Baidu encyclopedia-double carp
Baidu encyclopedia-carp (CYPRINIDAE)