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 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。
Using her unique feminism perspective, she panoramically described the life of the females of the lower strata in the society.
她以自己独特的女性视角下的女性文学，将下层女性的生存状态诠释得淋漓尽致。
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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