防洪大堤通常用来预防洪水。
由于伊利运河逐渐失去生意，有些防洪大堤开始破裂。
As the Erie Canal was losing business, some of its levees began to break.
走到4点过快到防洪大堤了，在一个凉亭补充了食物和水。
At about 4 PM, we were close to the bit mound for preventing flood; we bought food and water at a bower.
这些防洪大堤中最低的那些堤坝被建设来承受千年一次的潮汐波浪。
The lowest of those levees were built to withstand a one-in-1,000-year tidal surge.
为了保卫上海，工程师们已经沿着其河流延伸了几百英里长的防洪大堤。
To defend Shanghai, engineers have stretched hundreds of miles of levees along its rivers.
科学家们在一块六英里见方的试验田内进行了勘测，他们发现那些有机碳来自筑造防洪大堤取土用的浅塘，有机碳化合物沉淀至塘底并慢慢渗入地下。
Using a six-square-mile test plot, they found that the organic carbon comes from shallow ponds that were dug to provide soil for flood protection.
科学家们在一块六英里见方的试验田内进行了勘测，他们发现那些有机碳来自筑造防洪大堤取土用的浅塘，有机碳化合物沉淀至塘底并慢慢渗入地下。
Using a six-square-mile test plot, they found that the organic carbon comes from shallow ponds that were dug to provide soil for flood protection.
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