乌头白，马生角

Chinese

For pronunciation and definitions of 乌头白，马生角 – see 烏頭白，馬生角 (“when crows have white heads and horses grow horns; when pigs fly”). (This term is the simplified form of 烏頭白，馬生角).

Notes: Simplified Chinese is mainly used in Mainland China, Malaysia, and Singapore. Traditional Chinese is mainly used in Hong Kong, Macau, and Taiwan.