天空，是大自然最为壮观的艺术品。它的颜色时而湛蓝，时而柔和，时而绚烂，时而沉静。每一次望向天空，都能感受到它的美丽和神秘。The sky is a magnificent artwork of nature. Its colors are sometimes deep blue, sometimes soft, sometimes brilliant, and sometimes calm. Every time we look up at the sky, we can feel its beauty and mystery.