What do you mean by "seven disasters and eight difficulties" in Yi-ology?

I checked the information and found a word "three disasters and eight difficulties", which appeared in A Dream of Red Mansions this time. According to the encyclopedia, the word has Buddhist annotations, as follows: Buddhism believes that the world is a catastrophe from formation to destruction, and it goes through four stages: "success, living, bad and empty". In the later period of "robbery", all beings acted strangely and their life expectancy was shortened, and then disasters such as famine, disease and sword soldiers occurred one after another, which was called "small three disasters". At the end of the "evil robbery", more terrible fires, floods and storms occurred, which were called "three major disasters". The last storm swept the world away, thus entering an "empty robbery". Guo Song Xu Ruo's Painting Wen Jian Zhi (Volume II) records that at the end of the Tang Dynasty, Zhiyun and Shang had painted "Three Disasters in disguise" on several walls of Fuxian Temple in Luoyang. "Eight difficulties" refers to eight situations in which it is difficult to see Buddha, smell Dharma and practice: "One is hell, the other is beast, the third is hungry ghost, the fourth is deaf-mute, the five generations have an eye, before and after the six Buddhas, the seventh is depressed and single, and the eighth is longevity." The first three difficulties are "three evil ways", plus "blindness and deafness", which is called "bitter barrier" "Yu Dan Yue Guo" is the northern continent among the four continents, which means "victory" and happiness without wisdom; People live long and have no wisdom. The above two kinds of difficulties are called "music obstacle" difficulties. In addition, those who are "wise and knowledgeable" are self-righteous, which is called the difficulty of "increasing evil"; Those who are "before the Buddha and behind the Buddha" can't see the Buddha and hear the Dharma, which is the so-called difficulty of "being good and hiding". Then I saw a word similar to "seven disasters and eight difficulties", that is, "seven sufferings and eight difficulties". This word also comes from Buddhism, that is, the seven sufferings of life: birth, old age, illness, death, resentment, love, separation and ambition. Eight difficulties are the explanations of the eight difficulties in the first three disasters. I think seven disasters and eight difficulties should be similar to these two words. I can only find these materials, I hope they are useful to you.