a sheet of iron的用法和样例：
- The curtains were enveloped in a sheet of flame.
- He looks at the sun through a sheet of smoke glass.
- He tears a sheet of paper in two.
- She wrote her name and address on a sheet of paper.
- After the heavy frost the road was a sheet of ice.
- A sheet of iron,however,takes up most of the magnetic pull itself,and very little passes through the iron to attract anything on the other side.