Does anyone know the allusion and meaning of' Jinsha River is warm when it hits a cloud cliff, but Dadu Bridge is cold when it crosses the track'?

"Jinsha water beats the clouds and cliffs, and Dadu Bridge is cold." There is a couplet about water and the Red Army's conquest of water. The Red Army's forcible crossing of Jinsha River and Dadu River is of great significance in the history of the Long March. The Jinsha River is wide and swift, and Chiang Kai-shek dreamed of using this natural danger to panic in the Sichuan-Yunnan-Guizhou border region of the Red Army. 1935 In May, the Red Army skillfully crossed the Jinsha River. If crossing the Jinsha River skillfully is the cleverest and most successful battle of the Red Army in strategy and tactics, then crossing the Dadu River forcefully is the bravest and most tenacious battle of the Red Army. Dadu River is as dangerous as Jinsha River, and the enemy is heavily guarded. The cunning enemy also tore down the boards of the Luding Bridge on the river, leaving only thirteen iron cables. However, the heroic Red Army braved the enemy's bullets and broke through the Dadu River, crushing Chiang Kai-shek's plot to make the Red Army a second Shi Dakai. Therefore, the battle written in these two sentences has typical significance. The two sentences "Wuling" and "Wumeng" directly show the heroism of the Red Army through their subjective feelings, and these two sentences record stories through writing landscapes and show the heroic deeds of the Red Army through records.

The antonyms of "warm" and "cold" in the cervical couplet are two emotional acupoints carefully designed by the poet. The word "warm" is warm and joyful, showing the joy of overcoming difficulties; The word "cold" is cold and harsh, conveying the aftertaste after a narrow escape. Two adjectives are the great change of spirit and the fission of feelings. They are full of endless meanings, showing endless interest beyond them, swaying and undulating, and Zhang Chi has a feeling.