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
Chinese PinYin : bái wǎng hēi lái
From white to black
as far apart as heaven and earth. tiān rǎng zhī gé
walk in the dark and touch blindly. míng xíng máng suǒ