The origin of the poem: dark clouds crush the city and light shines on the sun. -Tang Lihe's free translation of "Wild Goose Gate Taishouxing": The war is urgent, like a dark cloud, crushing the city head. The soldier's armor sparkled in the sun. Interpretation: The poem shows the soldiers' perseverance and combat readiness, and shows the garrison and morale by sunshine. The scene is wonderful. Nowadays, people often use dark clouds to compare the seriousness of the situation, and the light of armor to compare the seriousness of the situation has some vitality, which we should pay more attention to.