a sheet of

例句：

1. 1.She spread a sheet on the floor to protect it from dirt.
   她在地上铺了一张纸来保护它不受灰尘污染。
2. 2. The chef cut a piece of meat for the guests.
   厨师切了一小块肉给客人吃。
3. 3.They gathered up all the pieces of paper and put them in a box.
   他们把所有纸片都收集起来放进一个盒子里。