foot wall

同根派生

英汉例句

• 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。
• 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。