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  •   你查询的单词是:stratum ([ 'streitəm ]
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  •   解释: n. 地层,阶层
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  •   例子: 1. A problem that cuts across all strata of society
       一个影响到一切社会阶层的问题。
    2. A sharp ridge with steeply sloping sides, produced by erosion of the broken edges of highly tilted strata.
       豚脊丘,陡峻的山脊由于对高斜层破碎山背的侵蚀而形成的陡峭的山背
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