Not a treasure. Once the pelican crows. The frost is strong and the grass is strong. Too much ambition and sense of loss. Tears in arms.
Postal stations in ancient China were run by state officials in all dynasties and served the rulers. However, private communication was extremely difficult. Du Fu, a poet of the Tang Dynasty, once described it in "Spring Hope": "The war rages on for three months, and a letter from home is worth ten thousand gold." This shows that in those war-torn years, an occasional letter from home was more valuable than ten thousand gold. Over the long ages, many ancient poems have records about conveying information. The author excerpts a few as follows.
Drums and horns urge dawn. Drumming is a method of delivering emergency warnings. It can be seen from the inscriptions of the Shang Dynasty that it is the earliest type of "sound and light" communication. The "Book of Rites·Xia Guan·Da Sima" of the Zhou Dynasty stipulates the use of drumming to convey signals: "The Chinese army uses ji to order drums, and all drummers have three drums." Drummers can convey orders by beating drums, boost morale, strengthen the military power, share the same hatred with the enemy, and move forward bravely. The drums and horns can be heard by each other, and the sound is endless. Cen Shen, a poet of the Tang Dynasty, said in his poem "Wu Wei Farewells Judge Liu to March to the West of Qishi": "There are few people traveling in the fifth month of the volcano, and the horses are as fast as birds. The guards are marching to the west of Taibai, and Hu Tianxiao is shaken by the sound of the trumpet."
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