1. She spread a fresh bed sheet over the mattress.
她在床垫上铺上了一张新的床单。

2. I need to buy new bed sheets for the guest room.
我需要为客房买些新的床单。

3. Please help me change the bed sheet.
请帮我换一下床单。

A: Can you help me change the bed sheet?
A：你能帮我换一下床单吗？

B: Sure, I'll get the clean ones from the cupboard.
B：没问题，我会从柜子里拿干净的床单过来。

1) 床单

2) 铺床用的布

1. 床单

e.g.
The bed sheet is made of soft cotton.
这张床单是纯棉做的，很柔软。

noun

1. A large piece of cloth used to cover a bed.