... 正常土 normal soil 正常地层 normal strata 正常层序 normal stratigraphic sequence ...
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normal consolidation strata 正常固结地层
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The abundant pyrrhotine and marmatite in ore showed that the ore-forming temperature was higher than normal strata-bound lead and zinc deposit.
矿石中的磁黄铁矿及铁闪锌矿的大量出现，预示着成矿温度较一般的层控铅锌矿床为高；
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