First of all, your mother really cares about you. Secondly, when you come down, you look up at the bright moon and lower your head to miss your hometown. It means: The first two sentences of the poem are about the illusion that the poet had in a moment in the specific environment of visiting a foreign country. For a person who lives alone in a foreign country, running around and busy during the day can dilute the sorrow of separation. However, in the dead of night, waves of longing for his hometown will inevitably arise in his heart. What's more, it's a moonlit night, let alone an autumn night with a frosty moonlight. The word "suspect" in "Suspect is frost on the ground" vividly expresses the poet's confusion when he first wakes up from sleep, mistaking the cold moonlight shining in front of his bed for thick frost covering the ground. The word "frost" is used even better. It not only describes the brightness of the moonlight, but also expresses the coldness of the season. It also highlights the loneliness and desolation of the poet wandering in a foreign country. The last two sentences of the poem deepen the homesickness through the depiction of movements and expressions. The word "wang" echoes the word "suspicious" in the previous sentence, indicating that the poet has turned from daze to sobriety. He stared at the moon eagerly and couldn't help but think that his hometown was also under the shining of this bright moon at this moment. This naturally led to the conclusion of "lowering my head and thinking about my hometown". The action of "lowering the head" depicts the poet completely in deep thought. And the word "thinking" leaves readers with rich imagination: the fathers and brothers, relatives and friends in the hometown, the mountains, rivers, plants and trees in the hometown, the lost years and past events... they are all missed. The content contained in the word "thinking" is really rich. Hu Yinglin, a scholar of the Ming Dynasty, said: "The quatrains in Taibai are composed of words. The so-called people who do not intend to work but do not work hard." (Volume 6 of "Shisou·Inner Edition") Wang Shimao believes: "(quatrains) in the prosperous Tang Dynasty, only Qinglian (Li Bai), "Long Biao (Wang Changling) has great attainments. Li Gengzi, who lived in Wangshang" ("Yi Garden Collection") What is "natural" and "no intention of work but no failure in work"? This song "Quiet Night Thoughts" is an example. Therefore, Hu specially brought it up and said it was "wonderful both in ancient and modern times". This little poem has neither strange and novel imagination, nor sophisticated and beautiful words; it only uses a narrative tone to describe the homesickness of distant visitors, but it is meaningful and intriguing. It has been like this for thousands of years. Attracts a wide range of readers. A person visiting a foreign country will probably feel like this: it's fine during the day, but in the dead of night, homesickness will inevitably surge in his heart; let alone a moonlit night, let alone a bright moon like frost. autumn night! The moon is white and the frost is clear, which is a clear autumn night scene; using frost color to describe the moonlight is also often seen in classical poetry. For example, Emperor Wen of the Liang Dynasty Xiao Gang's poem "Enjoying the Coolness in Xuanpu" contains the sentence "The night moon is like autumn frost"; and Zhang Ruoxu, a poet of the Tang Dynasty who was slightly earlier than Li Bai, used "The frost is flowing in the sky without noticing" in "Moonlit Night on the Spring River". "Fly" is used to describe the clear and clear moonlight, which gives people a three-dimensional sense, especially the wonderful conception. But these all appear in poetry as a rhetorical device. The poem's "suspected to be frost on the ground" is a narrative rather than an imitation of an object. It is an illusion produced by the poet in a specific environment for a moment. Why is there such an illusion? It is not difficult to imagine that these two sentences describe the scene of being unable to fall asleep late at night in the guest house and having the first short dream. The courtyard was lonely at this time, and the bright moonlight through the window shone in front of the bed, bringing with it the cold autumn night chill. The poet took a hazy first glance, and in his confused mood, it really seemed as if the ground was covered with a layer of thick white frost; but when he took a closer look, the surrounding environment told him that this was not frost marks but moonlight. The moonlight inevitably attracted him to look up and see a round of beautiful women hanging in front of the window. The space in the autumn night was so bright and clear! At this time, he was fully awake. The autumn moon is exceptionally bright, but it is also cold. For travelers who are far away alone, it is most likely to trigger the nostalgia for travel, making people feel that the guest situation is bleak and time is fleeting. Staring at the moon is also the easiest way for people to have reverie, thinking of everything in their hometown and their relatives at home. Thinking, thinking, his head gradually lowered, completely immersed in contemplation. From "doubt" to "raise head", from "raise head" to "lower head", it vividly reveals the poet's inner activities and vividly outlines a vivid picture of homesickness on a moonlit night. A short four-line poem, written in a fresh and simple way, as clear as words. Its content is simple, but at the same time it is rich. It is easy to understand, but it is difficult to appreciate. What the poet does not say is much more than what he has said. Its conception is meticulous and profound, but it is also composed without any trace. From here, it is not difficult for readers to understand the beauty of Li Bai's quatrains in terms of "nature" and "no intention of work but no lack of work".