The same life, the same life, the same vicissitudes. The past is unbearable, and the memory of the past is released by the pool. What does this poem mean?

This is a poem about releasing animals written by Zhao Mengfu, a great calligrapher in Yuan Dynasty. It means that it is destiny takes a hand to live and die with those animals in this life. It is like dreaming to experience the vicissitudes of the world with them. Because of ignorance, I did all kinds of wrong things that killed people before, so I can't go back and comment. I can only silently repent my previous "bad karma and sin" by the release pool!