What is the symbolic meaning of "rain" in Before the Rain?

Yearning for hometown. The first thing that touches readers is the depiction of spiritual images. The full text * * * presents six main images: The first image is "The last group of pigeons drew a circle with a faint flute in the breeze and disappeared." The reason is that the sky is too dark and strong, and birds mistakenly think it is night. Only by throwing all the birds in the sky into the forest can we know that this is the "last flock of pigeons". It can be seen that this is an image of a storm that has been brewing for a long time. The author uses the modality of the spirit bird to render the atmosphere before the rain. The second image is the strong and urgent desire for rain in the natural ecology. The earth is dry, the roots are thirsty, and the wicker is "a touch of light green, covered with dust and gaunt". The third image is the author's spiritual image, which is a spiritual longing in his current situation. Including the thought of hometown "fine grass-like drizzle caressing it with warm hands, making it covered with oily branches and leaves and blooming red flowers". The fourth image is "a white duck with unclean color in the urban river ditch". After the fight, "the gentleman walks down the willow tree" or "gets ready to sleep" and dreams. The fifth image is: the duckling in my hometown. The shepherd has a long bamboo pole in his hand. How happy his little team is. The sixth image: the eagle in the distance seems to be carrying "the angry sky, putting flat wings from the sky, almost touching the mound on the other side of the river ditch, flapping its wings and making a fierce sound", "it sounds like one. Or psychological image, giving people a vivid feeling. Those animals are very bright and clever. For example, pigeons returned home early because they "mistakenly thought" that they had reached the sky and "predicted" a storm; White ducks are "anxious" and "agitated" because of drought and thirst, but as long as it is a river ditch, even if it is "unclean", it is safe; Especially "Eagle in the Distance", its angry expression, soaring momentum and powerful call sign greatly shocked readers. And those static objects have also been activated, such as the wicker "haggard", the earth cracked, and the roots "look forward to rain" ... Even the rain uses the least pen but the most attentively, which is a very spiritual image. Everything. No matter how angry the world is and how it cries, "the rain still hasn't come." But the sky has always been gloomy, heavy and cold. What are the skills to make these natural images smart? It can be seen from the surface of the words that a large number of anthropomorphic descriptions are mainly aimed at humanizing and humanizing these biological animals, and they become conscious, conscious, sensual and even have a strong pursuit. Using such expressive skills, the objective image becomes an image full of the author's emotions. All the images converge into a whole artistic conception, creating a strong emotional atmosphere of long drought and rain.