casual observation

US 
UK 
  • un.随机观测;非定期观察
un.
1.
随机观测
2.
非定期观察

Sample Sentence

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