the lower strata of society 下层社会
upper jurassic-lower cretaceous strata 上侏罗下白垩统
lower palaeozoic strata 下古生代地层
The research may help explain why there is much consternation about wealth inequalityover the past two decades even though standards of living have improved for many in the lower strata.
这一研究可能有助于解释为什么在过去20年间，纵然许多社会低层人员的生活标准也得到改善，人们还是对贫富不均感到如此的恐慌。
The results indicate that the natural gas of the Xujiahe Formation mainly derived form the lower strata.
结果表明，研究区须家河组的天然气主要来源于下伏地层。
The ore forming material and media came from the strata of the Taihua Group and its lower strata, the granite magma and Mesozoic lake basin.
成矿物质及介质来源于太华群及下部地层、花岗岩浆和中生代湖盆。
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