Lu Ban and the Saw (锯子)

A long time ago, there was a craftsman (工匠) in China. His name was Lu Ban. 

One day, Lu Ban was at work on a mountain. A leaf cut his finger. Lu Ban thought, "How could such a small leaf hurt my finger?"

He looked at the leaf carefully. There were many teeth on the leaf, and the teeth were sharp (锋利的). "Could I make a tool with teeth like these? I could cut things with it easily," Lu Ban said to himself.

Soon Lu Ban made a saw. It was the first saw in the world. People are still using this tool today.