What is a berth under the optimistic sentence of Beibao Mountain?

This sentence is: ... night gives way to the ocean of the sun, and the old year melts in freshness.

Analysis: "... the night now gives way to the ocean of the sun, and the old year melts into something new": when the last night has not subsided, a red sun has risen from the sea; The old year has not passed, and the river has shown spring. The sea is born in the dead of night, which will drive away the darkness; Jiang Chun, the "spring" of river scenery, will break into the old year and drive away the severe winter. It not only depicts the scene truly and accurately, but also shows the universal truth of life, giving people optimistic, positive and upward artistic inspiration.