Number 166. It means that one person is riding away, and the other person is waiting for him to return alone in the boat, so it is 166.
The horse neighs on the waves and looks at the boat, and the people by the willow rest and wait for the boat to return.
It comes from "Lizhou Nandu" by Wen Tingyun of the Tang Dynasty.
It means the sound of horses neighing on the waves, watching the ferry passing by; people resting in the shade of the willows, waiting for the boat to return.