2016年12月4日 星期日

Underground tunnel, 地下隧道

Danilovskiy brook, Moscow. (Anna Arinova/ Caters News)
Motolskiy brook in Prague. (Anna Arinova/ Caters News)
ZIL plant in Moscow. (Anna Arinova/ Caters News)
Underground tunnels
https://www.yahoo.com/news/underground-tunnels-slideshow-wp-182540562.html

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