科研之友
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摘要
<正>福建省宁德市有一座传统的木拱无钉廊桥，这座廊桥横跨山谷，堪称一绝。Thanks to decades of perseverance by traditional craftsmen, a 1,000-year-old wooden arch bridge in Ningde City, Fujian Province, has managed to survive, and the skills used to make it have been adapted to modern life. The bridge, which resembles a rainbow in its outline, is a mortise and tenon structure built without using a single nail or rivet. A roof protects the bridge from weathering by the rain.
