When the stream is exhausted, it means retreating, while the whole sentence "when the stream is exhausted, it means walking along the stream by boat, reaching the end of the stream, and then taking the mountain road to move on, expressing the author's relaxed and happy mood.

The stream is full of mountains, but it comes from the "Three Roads in the Song Dynasty". The original text: Plum yellow days are sunny, and the stream is full of mountains. The green trees on the mountain road were as thick as they were when they came, and the Brushland of a few Oriole in the thick of the thick of the trees increased more pleasure than when they came.