| 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。The fossils lie embedded in a matrix of shale and sandstone.化石牢牢嵌在页岩与砂岩形成的脉石中。The cliffs are characterized by remarkable zigzagging strata of shale and sandstone.这些悬崖的特征是它们由一层层清晰易辨的页岩、石灰岩和砂岩交错构成。 |