If you don’t know the source, you must give the entire poem. Without context, it is difficult to analyze.
Based on the literal meaning, the long river may refer to the Yangtze River, the Yellow River, Weishui, etc. If the mausoleum in Lilinglin behind is interpreted as a mausoleum, then this long river should be the Weishui River, wrapping Chang'an. The imperial mausoleums of the Han and Tang dynasties were all located in the suburbs of Chang'an, and there were many of them.
The second sentence is a counterpoint to the first sentence. It is a technique often used in poetry, especially in seven-character and five-character quatrain poems. The long river faces the deep sea, Ju Jing barely copes with it, but Qiao Le Gao is a bit unsound, so I ask the questioner to take out the entire poem and analyze it together. Understanding the second sentence alone means that in the deep sea, the lonely cliffs stand there enjoying themselves.
But in this case, it is unclear what the connection between the two sentences is. We can only go as far as this, I hope it helps you
I don’t know the source, so I have to give the whole poem. Without context, it’s difficult to analyze.
Based on the literal meaning, the long river may refer to the Yangtze River, the Yellow River, Weishui, etc. If the mausoleum in Lilinglin behind is interpreted as a mausoleum, then this long river should be the Weishui River, wrapping Chang'an. The imperial mausoleums of the Han and Tang dynasties were all located in the suburbs of Chang'an, and there were many of them.
The second sentence is a counterpoint to the first sentence. It is a technique often used in poetry, especially in seven-character and five-character quatrain poems. The long river faces the deep sea, Ju Jing barely copes with it, but Qiao Le Gao is a bit unsound, so I ask the questioner to take out the entire poem and analyze it together. Understanding the second sentence alone means that in the deep sea, the lonely cliffs stand there enjoying themselves.
But in this case, it is unclear what the connection between the two sentences is. We can only go as far as this, I hope it helps you
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Now for additional answers to your supplementary questions:
First of all, you must know what your father’s official friend committed. What's going on? Is it serious?
Because the writing of these two lines of poetry is very poor and the level is very bad, it is not an exaggeration to say that he is arty. Don't be angry, this is a fact.
Back to the original topic and continue, because the level of the poem is so poor that the analysis of poetry cannot be based solely on the perspective of poetry. Now that you have told the background of writing this poem, you have come to two completely opposite conclusions:
1. Your father’s friend committed a serious crime. This person felt very sad after entering. I was inadvertently panicked, and in order to force myself to calm down, I wrote this poem to show that I was at peace and calm.