Cracks had appeared in the dam wall after the quake but workers had reinforced it with steel rods.

地震后水坝墙体出现了裂缝，但工人用钢筋加固了。

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They are European Ibex. They like to eat the moss and lichen which grows on the wall and they lick the salt off the dam wall too.

牠们是欧洲阿尔卑斯山的野山羊， 它们喜欢吃坝墙上的苔藓、地衣和舔坝墙上的盐分。

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The Zipingpu reservoir can hold a staggering 1.1 billion cubic meters of water, but the dam wall was cracked after the earthquake.

紫坪铺水库可以容纳11亿立方米的水，但是坝身在地震之后出现了裂缝。

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With the force of a giant waterfall, the dam burst,launching a wall of water 18 meters high down the funnel toward Johnstown faster than warnings could be sounded.

VOA: standard.2010.04.26

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？

麻省理工公开课 - 固态化学导论课程节选

In fact, the Democrat Gazette's pay wall is more of a revenue dam, intended to stop the flow of readers (and, thus, advertisers) away from print.

ECONOMIST: Charging for newspapers online

Like the Great Wall or, more recently, the Three Gorges Dam on the Yangtze River it's a classic imperial project, still possible under China's one-party system.

NPR: River Has Long Reflected China's Glories, Sorrows