Literature Reference: 不堪昨夜先垂泪，西去阳关第一声。—— 《听歌二首 二》 Unable to bear the tears shed last night, the first sound of departure towards the west. From 'Ting Ge Er Shou Er'.
雨: The life-giving rain that nourishes all things.
因: The cause, the reason, the pre-existing conditions that lead to the occurrence of an event.
Meaning: Rain's grace and the cycle of cause and effect, symbolizing the nourishment of life and the harmony of nature.