environmental standards

US 
UK 
  • un.环境保护标准
  • Web环境标准;环保标准;环境分析用标准品
un.
1.
环境保护标准

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