7.30/10 2012-05-24 60 의사록.HDHoover Dam is regarded as an engineering masterpiece and an American icon. But what if it did not exist today? How would engineers build it today? In this one-hour program, we ask a team of engineers what they would do the same, and what they would do differently...as we re-invent Hoover Dam.년: 2012사진관: National Geographic국가: United States of America