primary system

US 
UK 
  • un.主要系统;主系统
  • Web一次系统;一回路系统;值统
un.
1.
主要系统
2.
主系统

Sample Sentence

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