From white to black
Bai to heilai is a Chinese idiom, pronounced B á IW ǎ NGH ē IL á I, which means that the metaphor has changed greatly.
explain
Metaphors change a lot.
source
"Liezi Shuo Fu": "how can it be strange for you to make your dog white and black?"
Discrimination of words
[pinyin code]: bwhl
From white to black
one 's mind concealed more knowledge than could have been contained in five cartloads of books - xué fù wǔ chē
one 's happiness seemed to have dropped from the heavens - xǐ cóng tiān jiàng