closed circle

US 
UK 
  • un.闭锁环
  • Web封闭空间;封闭地带;闭口圈
un.
1.
闭锁环

Sample Sentence

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