keep flat

US 
UK 
  • un.必须平放
  • Web保持平放;注意平放;不可横置
un.
1.
必须平放

Sample Sentence

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