他们从太平洋78处不同地点采集了2000多份淤泥样本，分析发现这些样本含稀土元素的浓度集中在400-2230ppm之间。
They analyzed more than 2, 000 mud samples taken from 78 locations in the Pacific.
这些珍宝都属于赫拉克利翁和坎诺浦斯两座古城，这两座古城曾建于尼罗河三角洲地区，现在被埋在3米多深的淤泥之下。
The treasures belong to Heracleion and Canopus, cities built on the shifting ground of the Nile delta, which are now buried beneath three metres of silt.
无论是硬壳层还是淤泥质黏土层，粉喷桩复合地基的单位压缩值比塑料排水板排水固结法地基要小的多，黏土层的压缩模量得到了明显的提高。
The compressibility of the soft soil treated by the DJMP is smaller than that by plastic drain belt both for crust and silt soil. The modulus of compressibility of silty soil improves greatly.
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