One day, a man went to the tap with a pen and wrote four words "save water".
After writing, the man turned around and turned on the tap to wash the pen. The flow is small. In order not to wet his clothes, he is far away. Soon the pool was full, but he was still washing his pen. After a while, the little man came to the ground through the pool, like a flood.
This man clearly wrote four words of saving water, which is not the same as what he did. How I wish he could be strict with himself and act in accordance with his words!