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a large piece of thin cloth used on a bed to lie on or lie under 床单；被单 
Have you changed the sheets (= put clean sheets on the bed)? 被单你换了吗？ He slid between the sheets and closed his eyes. 他钻进被子里，闭上了眼睛。 white bed sheets 白色床单
Extra ExamplesCould you put some fresh sheets on the bed? 你能在床上铺上新床单吗？ He threw back the sheets and rolled out of bed. 他掀开被单，一骨碌起了床。 I pulled the sheet up over my nose. 我把被单拉上来盖住鼻子。 I simply wrapped the sheet around her. 我只是帮她把被单掖好。 I slipped under the sheets and was asleep in an instant. 我钻进被窝，一会儿就睡着了。 I threw a sheet over the sofa. 我用被单盖住沙发。 She had slept in her bed—the sheets were crumpled. 她在床上睡过——被单皱巴巴的。 She lay between the cool sheets. 她躺在被窝里，被单和褥单都很清爽。 The police had covered the body with a sheet. 警察已用被单盖住尸体。 The baby was wrapped in a sheet. 婴儿被裹在被单里。
Oxford Collocations Dictionaryadjective- clean
- crisp
- fresh
- …
- change
- fold
- put on
- …
- cover
- hang
- beneath a/the sheet
- under a/the sheet
- between the sheets
- …
- sheets and blankets
- be white as a sheet
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a piece of paper for writing or printing on, etc. usually in a standard size 一张（通常指标准尺寸的纸） - sheet of something
a clean/blank sheet of paper (= with no writing on it) 一张白纸 a sheet of A4 一张 A4 纸 Start each answer on a fresh sheet. 每题答案都分别写在一张白纸上。 Pick up one of our free information sheets at reception. 请在接待处拿一份我们的免费资料。
Extra ExamplesHe grabbed a blank sheet of paper and began to write. 他拿了张白纸开始写字。 Take a clean sheet of paper and start again. 拿一张白纸重新开始。 She tore a sheet out of her notebook. 她从笔记本上撕下一张纸。 The advertisement was a single printed sheet. 广告只是一张打印出来的纸。 a sheet of blotting paper 一张吸墨纸
Oxford Collocations Dictionaryadjective- blank
- clean
- A3
- …
- take
- use
- rip
- …
- music
- sheet of
- a sheet of paper
- sheet of something
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a flat thin piece of any material, normally square or rectangular 薄片，薄板（多指正方形或长方形的） - sheet of something
a sheet of glass/plastic/plywood/steel 一片玻璃/塑料/胶合板/钢板 sheet metal (= metal that has been made into thin sheets) 金属板
Oxford Collocations Dictionaryadjective- flat
- large
- thick
- …
- metal
- steel
- vinyl
- …
- sheet of
- sheet of something
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a wide flat area of something, covering the surface of something else 一大片（覆盖物） Extra ExamplesSheets of lava poured out. 一片片熔岩涌出。 Most of the surface is covered by a sheet of clay. 大部分表面被一层粘土覆盖着。
Oxford Collocations Dictionaryadjective- flat
- large
- thick
- …
- metal
- steel
- vinyl
- …
- sheet of
a large moving mass of fire or water 一大片，一大堆，一大摊（移动的火或水） - (specialist)
a rope or chain fastened to the lower corner of a sail to hold it and to control the angle of the sail 帆脚索；拉帆绳
on bed床上
of paper纸
flat thin piece片
wide flat area大片
of fire/water火；水
on sail帆上
Word Originnoun senses 1 to 5 Old English scēte, scīete, of Germanic origin; related to the verb shoot in its primary sense ‘to project’.noun sense 6 Old English scēata ‘lower corner of a sail’, of Germanic origin; related to Old Norse skauti ‘kerchief’.