高中英语词汇

ugly UK umbrella UN unable unbearable uncertain uncle uncomfortable unconditional unconscious under underground underline understand understanding undertake underwear undivided undo unemployment unfair unfair unfit unfold unfortunate unfortunately unhappy unhealthy uniform unimportant union unique unit unite universal universe university unknown unless unlike unmarried unpleasant unrest unsafe unsuccessful until untrue unusual unwilling up upper upset upset upstairs upward urban urge urgent usage use used useful useless useless user usual usually