natural barrier

US 
UK 
  • un.天然堤;自然障碍
  • Web天然屏障;天险;天然障壁
un.
1.
天然堤
2.
自然障碍

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard