sheet of protective aircraft

例句：

1. 1. She spreads the sheet on the bed to make it look neater.
   她在床上铺上床单，让床看起来更整洁。
2. 2. The old man slept on a thin sheet of straw.
   老人睡在一张薄薄的稻草床上。
3. 3. She carefully folded the sheet and put it in the drawer.
   她小心地把床单折叠好放进抽屉里。