趣英语 / shales例句

shales例句

Sandstones are, as a rule , interbedded with shales.
砂岩通常都与页岩互层.

Oil - yielding organic matter is contained in the shales.
在这些页岩里有产油的有机物质.

Alternating sandstones and shales are regarded as important.
蚀变的砂岩和页岩是很重要的.

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