bottom up倒置； 颠倒； 倒着bottomn.底部；底端adj.底部的v.触底；打(基础)bottom supportin drilling platform定柱沉垫式钻井平台bottom supporting drilling platform定柱沉垫式钻井平台bottom dumping material handing box活底料斗bottomless concrete boxed cofferdam无封底砼套箱Bottom Environmental Sensing System海底环境探测系统bottom-blown converter steelmaking氧气底吹转炉炼钢bottom-to-top syntactic analysis自下到上语法分析bottommost life security institution最低生活保障制度bottommounted wave recorder analyzer海底波浪自动记录分析仪bottom-up method of designing webs自下至上Web设计法