bottomer井底把钓工bottomn.底部；底端adj.底部的v.触底；打(基础)bottom roll assembly下轧辊组合部件bottom water ballast双层底水压载Bottom slab breaking底板崩裂bottom- up strategy正向策略bottom-opening skip开底式翻斗bottom-side sounder底视探测仪bottom friction layer底摩擦层bottom-hole storage井筒储集bottoms-up research市场研究bottom corners of tag标签底角

1. A vertical fault has neither a footwall nor a hanging wall.
   具有直立断层面的断层既无上盘，也无下盘。
2. Then the block in the southern side of this fault is the hanging wall and the block in the northern side of this fault is the footwall.
   那么，位于这条断层南侧的岩层是上盘，位于这条断层北侧的岩层则是下盘。