adamantinebrazencalculouscallousfirmerflintlikeflintygranitichardimpenetrableironboundmarblepetrosalpetrousrigidsolidsteelstiff groundunyielding坚硬: hard; solid; stiffness; rigi ...的: 4次方是 The fourth power of 2 i ...硬的,坚硬的,硬的: durus半坚硬的: semi hard; semi-hard包铁的, 坚硬的: ironbound下载手机词典可随时随地查词查翻译