solid bed坚硬: hard; solid; stiffness; rigi ...层: I storey; tier; stratum硬层: hard formation; hardened horizon坚硬: hard; solid; stiffness; rigidity; flintiness 坚硬的岩石 solid rock; rag; 坚硬度 flintiness淬硬层: quench-hardened case下载手机词典可随时随地查词查翻译