Bottomlyn.博顿利bottomn.底部；底端adj.底部的v.触底；打(基础)bottom outrigger下部构架bottom guide bar下端导杆bottom tap ladle塞棒式铸钢桶bottom-sealing封底bottoming reamer平底铰刀,精铰刀bottom ring beam底部圈梁Bottom drawpoint底部放矿口bottom recessive隐性基因纯合体bottom community水底群bottom chord bar下弦杆