2017年4月7日 星期五

tunnel-drilling machine, 隧道鑽機

Workers celebrate by posing inside the giant teeth of Seattle’s tunnel-drilling machine, Bertha, the world's largest tunnel-boring machine at its completion into the disassembly pit in Seattle, Washington, U.S., April 4, 2017. (Photo by Karen Ducey/Reuters)
The Day in Photos – April 5, 2017 

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