当时古人对技术不重视，没留下更多记载。宋代的航海已经很发达，海船能载几百吨货物。链接在内

来源: Shubin 于 2025-09-25 07:35:17 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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