"and how clear in the water the nearness of the moon!" means that because the river is clean, the reflection of the moon in the water is big and round. When people look at it on the boat, they only feel that it seems to be particularly close to people. In this sentence, the poet also gives deep emotion, that is, writing its spirituality with the proximity of the moon. It seems to know that the poet's homesickness can't be released, and he can't stop thinking about it. This is the meaning of the word "being close to the moon". In this way, the last two sentences of this poem are not purely for scenery writing, but the scenery language permeated with the poet's strong emotional color, which is a famous sentence with affection in the scenery. Zhang Qianyi, a Qing dynasty poet, "The word' low' and' near' are the so-called poetic eyes of the Song Dynasty, but there are no scars. This is also the beauty of Tang poetry." A bright moon, hanging in the sky, but considerate, seems to be getting closer and closer to the poet, adding a warm and cordial feeling to the poet in loneliness.