shales [ʃeɪlz]

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附加级

n.页岩( shale的名词复数 )

Sandstones are, as a rule, interbedded with shales. 砂岩通常都与页岩互层。来自辞典例句
Oil-yielding organic matter is contained in the shales. 在这些页岩里有产油的有机物质。来自辞典例句