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历史:
prev·a·lent
\\-lənt\\ adjective
 ETYMOLOGY  Latin praevalent-, praevalens very powerful, from present participle of praevalēre
 DATE  1576
1. archaic : powerful
2. being in ascendancy : dominant
3. generally or widely accepted, practiced, or favored : widespread
prevalent noun
prev·a·lent·ly adverb

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