2. From the overall conception, this poem mainly says that the seasons change rapidly and time is gone forever, so people are advised to cherish their youth, work hard and make a difference. The whole poem conveys feelings with scenery and is reasonable from feelings. It reposes the life philosophy of "Young people don't work hard, old people are sad" with vivid images such as morning dew is easy to dry, Qiu Lai leaves fall to the roots, and rivers flow to the east. With the help of the morning dew, the flowers fall in autumn, and the running water goes east and never returns, there is a sigh that time flies and life is short, encouraging people to firmly grasp the life that flies with time and make progress while they are young. Its emotional tone is positive. Its main idea is embodied in the last two sentences, but the poet's thoughts are not simply expressed, but concrete images rich in aesthetic feeling are extracted from the real world and taught in aesthetics.