底部结构

1.substructure  

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

部的英语翻译：

ministry; office; part
【医】 board; department; loci; locus; pars; part; Partes; piece; portio
portiones; regio; region
【经】 ministry

结构的英语翻译：

frame; structure; composition; configuration; construction; fabric; mechanism
【计】 frame work
【医】 constitution; formatio; formation; installation; structure; tcxture