Literally, this poem is not difficult to understand. If we analyze it deeply, it may rise to a philosophical question.
Let me give you some advice.
First, "peaks and valleys turn into ravines, and ravines rise into mountains." This is a geological movement that takes a long time. Therefore, it refers to the vicissitudes of the world, which means that the world has changed for a long time. " "Sun and Moon" refers to the infinite cycle of day and night, constantly changing. Seeing the sun during the day and the moon at night is a common metaphor in poetry.
So the whole sentence means: in the infinite distant time, day and night still appear alternately chasing each other.
Second, whoever collects dust can't come back.
This sentence can actually echo the poem in the Four Immortals Notice: It is better to laugh back at the world of mortals, * * * I am Xiu Fei. Obviously, in Xiansi's worldview, colorful red dust grievances are regarded as returning home. Obviously, Xiao Xuan's road is not the road of the world of mortals, but the road of chasing endless time and space. This reminds me of the Buddhist saying that there is no end to suffering. On the contrary, in Buddhism, the world of mortals is a sea of suffering, but in Xiansi Middle School, the world of mortals is a place of refuge. Perhaps the author thinks that it is better to be drunk in the world of mortals than to be lonely for nine days. )
Third, I want to break through the water with my sword. In China's allusions, "losing water" is compared to the passage of time. Cutting off water with a sword represents an emotion. Because we all know that water is flowing and has no fixed form, it is impossible to cut off the water flow by waving a sword. In other words, the action of cutting off water with a sword is just an emotional catharsis, which represents the hero's attention to time. He hopes that time can stay, but time won't really stay.
Fourth, they threw their youth to grab the ashes. Echoing the above sentence, there will naturally be no effect of cutting off water with one sword. What if time can't stay? Of course, youth turns to dust. There is a word to pay attention to here: robbery. In modern vocabulary, this word refers to disaster, unexpected disaster and so on. However, this word, in its original meaning, is a unit to describe time in ancient Buddhism. "Robbery" is the time from destruction to rebirth of the world. So in Xiao Xuan's related materials, robbery is used many times. We can refer to more information to understand the significance of this robbery:
When will you fly? (In the story of the Phoenix Flower, a poem commemorating Lingfeng) It is a metaphor for the limited loss of life, but it is difficult to expect the reunion in the infinite future.
Loneliness is always hard to grab (Xiao Xuan theme song name)
Forever robbery (theme poem title)
There are several definitions of "eternal robbery", all of which refer to the eternity of time. Personally, the word "robbery" in this poem always has a long, long meaning. Youth is short and time is long. Limited youth can only be reduced to ashes in endless time.