not occur even in a hundred years
It's a Chinese idiom, Pinyin is B ǎ ini á NN á NY ù, which means it's hard to meet in a hundred years. It's rare or hard to meet. From the story of heroes and heroines.
The origin of Idioms
The ninth chapter of biography of children heroes written by Wen Kang of Qing Dynasty: "it's especially unreasonable to say that if you are equally moved to throw away such a life-long important event and a once-in-a-hundred-year good relationship and give your hands to Zhang Jinfeng, who has nothing to do with my first meeting."
Idiom usage
It is difficult to meet things. This kind of strange thing is rare in a hundred years. Today, it's an eye opener.
not occur even in a hundred years
be friends in the days when hard up - pín jiàn zhī zhī
be fraught with grim possibilities - xiōng duō jí shǎo