功勋卓著的惠通桥（以物鉴史）

Core Viewpoint - The article highlights the historical significance of the Huitong Bridge in Yunnan, which served as a crucial transportation link during the Second Sino-Japanese War, facilitating the supply of materials and troops for the Chinese military efforts against Japan [1][2][3]. Historical Significance - Huitong Bridge is located on the Nu River and was the only passage for the Burma Road during the war, playing a vital role in the logistics of the Chinese forces [1][2]. - The bridge has a rich history dating back to the Song and Yuan dynasties, serving as a key point on the Southern Silk Road [1]. - It was originally built as an iron chain suspension bridge and was later upgraded to a steel cable suspension bridge in 1938 to support heavier traffic [1][2]. Military Engagements - In May 1942, Japanese forces attempted to capture the bridge, leading to a critical moment where Chinese defenders blew up the bridge to prevent its capture, successfully halting the Japanese advance [2]. - The bridge was repaired in July 1944, becoming a major route for the Chinese counteroffensive and supply lines during the war [2]. Preservation and Recognition - After being decommissioned in 1974, Huitong Bridge was preserved as a historical site and was designated as a provincial cultural heritage site in 1993 [3]. - It underwent comprehensive restoration in 2015 and was recognized as a national key cultural relic in 2019, underscoring its importance in Chinese history [3]. Structural Details - The bridge features a typical reinforced wooden truss steel cable suspension design, measuring 154 meters in length and 5.6 meters in width, with a height of 30 meters for its piers [3]. - A commemorative monument detailing the bridge's history is located at the southern end, serving as a primary source for understanding its significance [3].