combe /ˈkum, ˈkom/
  [三面皆山的] 深陷的山谷;狹谷
  Comb, Combe n.  That unwatered portion of a valley which forms its continuation beyond and above the most elevated spring that issues into it. [Written also coombe.]
  A gradual rise the shelving combe
  Displayed.   --Southey.
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