白底

白的英语翻译：

clear; free of charge; in vain; pure; white; whiteness
【化】 leuco-; leuko-
【医】 albo-; leuco-; leuk-; leuko-

底的英语翻译：

a copy kept as a record; base; bottom; end; fundus; the truth of a matter
【医】 base; basement; bases; basi-; basio-; basis; batho-; bathy-; fimdi
floor; fundus; pavimentum; solum