单词	coal
释义	coalcoal /koʊl/ ●●● W3 noun Etymology ETYMOLOGYcoal Origin: Old English col 1 [uncountable] earth science a black mineral that is dug from the earth and burned for heat:  coal miners2[countable usually plural] a small piece of something such as wood or CHARCOAL that is glowing because it is burning or has been burned:  Grill the steaks over medium-hot coals for 5–7 minutes on each side. [Origin: Old English col] → see also rake somebody over the coals at rake2 (4)
随便看	runoff primary run-of-the-mill run-on sentence runt run-through run-up runway rupee rupiah rupture rural rural delivery rural free delivery rural route ruse rush rushed rush hour Rushmore, Mount Russell, Bertrand Russell, Bill Russell, Charles russet Russia Russian

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