八月二十二日手书拜悉。敝作中“建成的桥,用料省,结构巧,强度高”一语,对赵州桥而言,“结构巧”指的主要是“大拱的两肩上,各有两个小拱”,因为在这以前,大拱的两肩,都是用石料或土石填满的,名为“实肩拱”,而赵州桥则是首创的“敝肩拱”,其优点文中已说明。 Handbook was written on August 22. In the phrase “completed bridges, used materials, sturdy structures, and high strength”, for Zhaozhou Bridge, the term “structured structure” refers mainly to “two shoulders on each side of the big arch, each with two small arches. “Because, before that, the shoulders of the Grand Arch were filled with stone or earth and stone, called ”solid shoulder arches,“ while the Zhaozhou Bridge was the first ”shoulder arch". Its advantages have been explained in the article. .