sheet

n.床单; 被单; 一张(通常指标准尺寸的纸); 薄片，薄板(多指正方形或长方形的) 复数：sheets过去分词：sheeted过去式：sheeted现在分词：sheeting第三人称单数：sheets 牛津词典 noun 床上 on bed 床单；被单a large piece of thin cloth used on a bed to lie on or lie underHave you...