built upon is build upon's Past Tense

build upon

US 
UK 
  • na.“build on”的变体;同“build on ”
Simple Present:builds upon  Present Participle:building upon  Past Tense:built upon  
na.
1.
“build on”的变体
2.
同“build on ”

Sample Sentence

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