一年之后，张树森建立了红歌会。

A year later, Mr. Zhang founded the Red Song Association.

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张树燕。轻质墙体隔声性能研究。西安：西安建筑科技大学，2009。

Zhang Shuyan. Study on the sound insulation of light-weight wall. Xi 'an: Xi' an University of Architecture Technology, 2009.

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中国中部大型工业城市西安市的房产中介公司——21世纪不动产公司的经纪人张树肖表示：“西安不像上海或北京那样存在泡沫。”

According to Zhang Shuxiao, an estate agent at 21st Century in Xian, a large industrial city in central China: "there is no bubble here like there is in Shanghai or Beijing."

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