Pick up all the cold branches and refuse to live on them, the lonely sandbank is cold. what does it mean,

"It picked up all the cold branches and refused to rest on it, and the lonely sandbank was cold." It writes that Gu Hong encountered misfortune, harbored hatred and fear, flew back and forth among the cold branches, picked up all the cold branches and refused to rest on it. , had no choice but to stay on a lonely and cold sandbank and spend such a cold night. Here, the poet uses symbolic techniques to ingeniously express Hong's loneliness and mist, turning around in shock, embracing resentment, and choosing a place to stay, expressing the author's lonely situation when he was relegated to Huangzhou and his noble self-profession and unwillingness to follow the crowd. state of mind. The author and Gu Hong cherish each other. He uses anthropomorphic techniques to express Gu Hong's psychological activities and objectifies his own subjective feelings, which shows superb artistic skills.