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Men who worked at night on the dam suffered less, but the heat was still as high as thirty degrees Celsius.
VOA: special.2009.08.12
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And if the distance between the wall and the dam was large in comparison to the wavelength then what happens?
如果水槽壁,和屏障之间的距离,大于波长,会导致什么？
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As you can see, I work here in the Macombs Dam Park where the track is at.
正如你所看到的，我在这里的梅可姆公园工作，那条小路就在那儿。
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Before he was president, Mister Hoover worked for many years to make the construction of the dam possible.
VOA: special.2009.08.12
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If this distance is large in comparison to the wavelength, this dam simply casts a shadow.
如果这个距离,比波长更长，水槽中的屏障就会投下阴影。
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Men in two special factories worked day and night to make the concrete building material for the dam.
VOA: special.2009.08.12
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For example, you could put a dam in the middle of the tank.
举个例子,在水槽中间放个屏障。
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She wanted to tell the story of the people behind the industry: In this case, the people who were building the dam.
VOA: special.2009.05.17
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In nineteen eighteen, a man named Arthur Davis proposed building a dam to control the Colorado River.
VOA: special.2010.10.27
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They enter a special visitors' center to learn about the dam and the men who built it.
VOA: special.2009.08.12
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It cannot be changed. The expression comes from the idea that water that has fallen over a dam cannot be brought back again.
VOA: special.2009.05.10
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He said the dam should be built in an area called Boulder Canyon on the border between the states of Arizona and Nevada.
VOA: special.2009.08.12
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Bourke-White took pictures of those people C at the dam,in the rooms where they lived, and in the places where they had fun.
VOA: special.2009.05.17
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Workers also used more than twenty million kilograms of steel to strengthen the concrete in the dam.
VOA: special.2009.08.12
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Today,visitors can see a statue of the men who worked as high scalers to build Hoover Dam.
VOA: special.2009.08.12
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It was a picture of a new dam being built in the western state of Montana.
VOA: special.2009.05.17
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The official name of the Hoover Dam bypass is the Mike O'Callaghan-Pat Tillman Memorial Bridge.
VOA: special.2010.10.27
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It was agreed this could be more easily done with the aid of a dam.
VOA: special.2009.08.12
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Engineers decided the rock would provide a good strong support for the proposed dam.
VOA: special.2009.08.12
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They built a large road from Boulder City to the area of the dam.
VOA: special.2009.08.12
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The small shapes of two men at the bottom showed the dam's huge size.
VOA: special.2009.05.17
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Many visitors say they thought the name of the huge structure was Boulder Dam.
VOA: special.2009.08.12
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Visitors leave the great dam with an understanding of how difficult the project was.
VOA: special.2009.08.12
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Workers built a town called Boulder City to house employees working on the dam.
VOA: special.2009.08.12
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This had to be done so the floor of the dam could be built.
VOA: special.2009.08.12
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Workers called "high scalers" were some of the first to begin building the dam.
VOA: special.2009.08.12
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They had used almost four million cubic meters of concrete in the dam.
VOA: special.2009.08.12
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Visitors to Hoover Dam drive on a small road that passes Lake Mead.
VOA: special.2009.08.12
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Many others were injured. The Hoover Dam is two hundred twenty-one meters tall.
VOA: special.2009.03.04
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At the time, it was the largest and tallest dam in the world.
VOA: special.2009.03.04
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