"Farewell to Yang Zi" is a typical farewell poem. You can tell from the word "send" in the title. Li Bai's friend Yang Zi is about to leave Weicheng for Yingshang. Li Bai saw him off and wrote this poem. The first couplet: indicates that the place of farewell is outside Weicheng, at a country hotel. As you can imagine, this is a simple place, just because this is the last hotel to send off relatives and friends, so there are many travelers and people seeing off in the hotel. When bidding farewell to friends, one must drink wine. Firstly, it is for travelers to have a strong journey, and secondly, it is to borrow wine to say goodbye. Li Bai was a poet and knight who was good at drinking. Because of his bold temperament, he does not use cup as the quantifier for drinking, but uses "dou". How many kilograms does a bucket weigh? The most commonly used volume unit in the Tang Dynasty was "dou", 1 dou = 10 liters, and there were "big dou" and "small dou". Converted to the current international units of measurement: 1 large bucket = 6000ml, 1 small bucket = 2000ml. The measurement unit of wine is generally calculated using "small bucket", so "1 bucket of wine" is about 2 kilograms, which is 4 kilograms. My dear, Li Bai is such a good drinker! Of course, the wine at that time was rice wine, which had a very low alcohol content. But after drinking four kilograms of wine, even if you are not drunk, your belly will become round. Since this is a statement in poetry, it cannot be taken to be true and can be understood as an exaggeration. But there is no doubt that Li Bai liked drinking and was good at drinking. Especially when bidding farewell to friends for a distant place, it is easier to get emotional and drink more. It can be seen from this aspect that Yang Zi, who is about to travel far away, should be Li Bai's close friend. After drinking a bucket of wine, he became drunk. Even when he was drunk, he was unwilling to fall asleep. After all, the poet did not want to miss every minute and every second before parting with his friends. It can be seen from this that Li Bai really does not want to be separated from Yang Zi. The couplet does not describe wine, but scenery. What scene? In front of me, thousands of pear trees are as beautiful as snow, and thousands of poplar leaves are as light as smoke. Each of these two sentences uses a metaphor. The previous sentence compares the white pear blossoms to white snow. Write about the many pear blossoms and their pure whiteness. This metaphor can also be understood as the sincerity and innocence of the relationship between the two. In "The Song of White Snow Sending Magistrate Wu Back to the Capital", Cen Shen said, "Suddenly a spring breeze came overnight, and thousands of pear blossoms bloomed on the trees." He compared the flying snow in the sky to pure white pear blossoms. It can be seen that comparing pear blossoms to white snow was a metaphor commonly used by poets in the Tang Dynasty. The poplar leaves are like smoke, which is the effect of overlooking from a distance. The poplar leaves have a deep green color, and when viewed from a distance, they indeed have a smoke-like effect. The neck couplet turns to the farewell scene again. "Send you a thousand miles away, but you will eventually have to say goodbye." When he had to say goodbye, the poet had no choice but to order some wine and get drunk with his friend again; on the way to parting, Li Bai gave his friend a riding whip, hoping that his friend would speed up and get married as soon as possible. Arrive at your destination. The first three couplets are realistic farewell scenes. The last couplet is fictitious and is Li Bai's imagination. The poet seems to have seen his friend return to Yingshang after half a month - the new moon refers to the first quarter moon and the beginning of the month, and "daojiayuan" refers to the fifteenth full moon. He expressed his concern and best wishes for his friend's future back home. This is also a side reflection of the deep relationship between the two. In this poem, Li Bai bid farewell to his friend from Weicheng and returned to Yingshang. Although he was reluctant to leave, at the moment of departure, the poet put away the pain of separation and gave his friend a riding whip, hoping that his friend would speed up and return to his hometown as soon as possible. The poet turned from the pain of separation to wishing his friends a smooth return home. This actually reflects Li Bai's open-mindedness and optimism, and is also the embodiment of Li Bai's heroic and detached personality.