The Hou Qi room in 《Xu Han Shu-Lu Li Zhi》and the sound insulation from the urn wall records by Fang Yizhi embody sound insulation technology of the ancient China.
《续汉书·律历志》中的“候气之室”是中国古代高级隔音室，方以智记载的“瓮墙”隔声能满足日常生活的隔声需要，这表明中国古代的隔声技术已达到很高的水平。
Ji into the ancient city site is located Jingning County Rural Zhiping Liu village, home to the Western Han Dynasty by Cheng Zhi Ji County.
成纪古城遗址位于静宁县治平乡刘河村，为西汉所置成纪县治。
Ji into the ancient city site is located Jingning County Rural Zhiping Liu village, home to the Western Han Dynasty by Cheng Zhi Ji County.
成纪古城遗址位于静宁县治平乡刘河村，为西汉所置成纪县治。
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