底弦

【化】 bottom chord

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

弦的英语翻译：

bowstring; catgut; chord; quadrature; subtense
【电】 string