bottomed... 底的底是 ... 的bottomn.底部；底端adj.底部的v.触底；打(基础)Bottom water conning底水锥进bottom delivery feed下排式排种器bottom well stripper底部圆筒汽提器bottom ratchet wheel下棘轮Bottom Argon Blowing底吹氩bottom gully erosion底部沟蚀bottom blown furnace底吹炉bottom hole pressure井底压力bottom-loaded pile托桩bottom current meter底层流速计