bottomed... 底的底是 ... 的bottomn.底部；底端adj.底部的v.触底；打(基础)bottomless bars.裸体舞酒吧bottom of the heap堆放bottom-up design自底向上设计bottom of blastula胆囊底, 囊胚底bottomhole pressure井底压力bottom-head rivet[机] 圆头铆钉bottom-dump wagon底开式料车bottom blown oxygen氧气底吹bottom trawl survey底拖网调查bottom water sprays下喷水器