名词
中文翻译：床单卷曲
同义词：
['bed sheet', 'bed roll']
例句：
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1.The sheets were so tight that they almost felt like a blanket.
床单紧绷得几乎像毯子一样。
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2.She had to unroll the sheets before she could get into bed.
她必须先展开床单才能上床。
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3. The sheets were stained with blood, and it was hard to tell where the wound was.
床单上沾满了血迹，很难分辨伤口在哪里。