一张纸

• a piece of paper
• a sheet of paper

例句

1. 这封信只用一张纸写成。
   The letter was written on a single sheet of paper.
2. 他突然从口袋里取出一张纸，在我们面前挥动着。
   He whipped a piece of paper out of his pocket and waved it in our faces.
3. 能给我一张纸吗？
   Could you give me a piece of paper?
4. 请递给我一张纸巾。
   Please pass me a piece of paper handkerchief.