乙的英語翻譯：

second
【建】 acetonitrile; ethane nitrile

底的英語翻譯：

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

酸的英語翻譯：

acerbity; ache; acid; grieved; pedantic; sour; tartness
【化】 acid
【醫(yī)】 acidum