2015년 3월 10일 화요일
The World’s Largest Tunnel-Boring Machine Must Be Saved http://www.popularmechanics.com/technology/infrastructure/a11265/the-worlds-largest-tunnel-boring-machine-must-be-saved-17201135/?mag=pop&click=yr TBMᆞ seattle ess
http://www.popularmechanics.com/technology/infrastructure/a11265/the-worlds-largest-tunnel-boring-machine-must-be-saved-17201135/?mag=pop&click=yr
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