oil refining

US 
UK 
  • un.炼油;石油炼制
  • Web石油冶炼;石油精炼;精炼石油
un.
1.
炼油
2.
石油炼制

Sample Sentence

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