Migrant worker, tunnel. 農民工, 隧道

Pool photo from Reuters
Migrant workers sleeping inside a tunnel in Hefei,  Anhui Province. About 54 percent of Chinese live in towns and cities, but only 36 percent are counted as urban residents under registration rules.
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中國城市化目標終於撼動城鄉戶籍壁壘 - 纽约时报中文网 国际纵览
With Urbanization as Goal, China Moves to Change Registration Rules
http://cn.nytimes.com/china/20140731/c31hukou/zh-hant/
Migrant worker - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Migrant_worker
民工 - 維基百科，自由的百科全書
民工，也稱為農民工、外來工，指的是為了工作從農村移民到城市的人。
http://zh.wikipedia.org/wiki/%E5%86%9C%E6%B0%91%E5%B7%A5
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