13-50 years old. "The Deep Sea" is a foreign poetic literary work, also called "Paul Celan's Strange Poetics". The poem contains a lot of philosophical truths. Although I started reading at the age of 13, I have no interest in philosophy. It will have a certain role in cultivating sentiments, and the understanding of this poem will gradually deepen in the future. After the age of 50, because the thoughts have been finalized, it is not suitable to read this kind of philosophical works again, and it is easy to have a great negative impact on oneself. negative impact.