This sentence came from the Tang Dynasty poet Li Bai's "Silent Night Thoughts." This poem depicted a person missing a lover far away at night."The moon on the sea is the moon in the sky, and the person in front of me is my sweetheart" expressed the deep feelings of longing and the helplessness of not being able to meet. If you want to answer this question, you can start from the following aspects: 1. Understand the background and meaning of this sentence. This poem was written by Li Bai when he was missing his lover in the distance. It expressed his longing and love for his lover. The background of this sentence was that the moon on the sea at night was brighter than the moon in the sky, which further highlighted the poet's longing for his lover. 2. Combining literary schools and writing styles. This sentence came from Li Bai's poem in the Tang Dynasty, which belonged to the bold and unconstrained school of Tang poetry. Most of his works were bold, unrestrained, free, and open-minded. This poem was no exception. 3. Analyzing the emotional expression of this sentence. This sentence expressed the poet's longing for his distant lover through phrases such as " the moon on the sea is the moon in the sky " and " the person in front of him is his sweetheart ". The " sea " in " the moon on the sea is the moon in the sky " could be understood as the poet's environment emphasizing the poet's inner loneliness and longing; while the " sweetheart " in " the person in front of him is his sweetheart " referred to the poet's most loved person, expressing his deep feelings and helplessness. To sum up, this sentence could be answered by analyzing the background, emotional expression, and literary genre.