Poetry is a carrier with strong subjective intention, and the understanding of the protagonist who asks questions is reasonable. The sun is warm and the sun is far away.
Let's start with the first question. To see the sun, for all his glory, buried by the coming night, and the image of "Sunset Red on the Western Hills" can explain that the sunset is a beautiful image, so people always feel a little cold when they mention "Sunset" (bleak, sad, or better, returning); Another problem is "within reach". Although the sun is far away, it is not contradictory that the sun is covered by the earth.
The above is a literal understanding. From the content, it is not difficult to see that this poem is written for the mother, expressing the author's mourning for the loss of her mother and her deep gratitude and yearning for her. . . "Pointed out the course of human life, and the last sentence" It's a cold twilight within reach "pointed out that life has an end. If it is a "sad school", it can be understood that life is short and people are born to die; If it is the "motive force", it can be understood that the mother loves heaven and earth; The "peace faction" can be understood as "dust to dust, soil to soil". . .
Hehe, a little opinion, I hope it will help you. . .