油页岩 yóuyèyán oil shale Definitions Defs Origin Strokes Stroke Words Sentences Sents 油 yóu noun oil oil; fat; grease; any of various liquid fats or hydrocarbons used as food, fuel, or lubricants页岩 頁岩 yèyán shale a type of sedimentary rock formed from mud or clay that splits easily into thin layers
