Fitted sheet
01
床笠, 弹力床单
a bed linen made of elasticized fabric that is designed to fit snugly over a mattress, with the corners of the sheet shaped to fit over the four corners of the mattress
例子
The fitted sheet kept slipping off the corners of the mattress, so I had to tuck it in again.
床笠不断从床垫的角落滑落，所以我不得不再次把它塞进去。
