Flowing water and scouring the sand do not pause, and the previous wave is not extinguished and the next wave arises.

Explanation: The running water keeps washing away the gravel in the water. Before the front wave is flat, the back wave rises again.

As you can see, even if the cloth is cheap and the distance is small, it can still be used.

Explanation: It doesn’t matter your status when giving opinions. If you have your own opinions, even if you are a commoner or a low-status official in a remote area, you can still be adopted and used by others.