The first Bridges made by humans were probably spans of cut wooden logs or planks and eventually stones, using a simple support and crossbeam arrangement.
而人造桥则是由切段原木或是厚木板、石头搭建起来并用横梁做支撑的拱。
Thee pavilion, built in 24 different systems of brackets inserted between the top of a column anda crossbeam, is the cream of China's extant high-rise pavilions of wooden structure.
观音阁建在24不同体系的斗拱插在柱和横梁之间，是中国现存木制结构阁的顶峰。
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