What does it mean to welcome birds in the Woods in summer?

With the arrival of summer, Xiaoman solar term came, and the birds in the forest began to sing happily. A line in Wang Zhihuan's poem "Lusu" in the Tang Dynasty: "The mountains cover the day, and the sea exhausts the golden river. By going up one flight of stairs unconsciously broke the morning by watching the sleeping sickness in spring thousands of miles away, and the chirping birds disturbed my sleep. How many flowers fall after a stormy night. Summer is full, and birds in the forest are happy. " This sentence describes the changes of nature and the joy of life, and expresses the author's admiration for vitality and vision for the future.