An user French
says…

Cette
Determiner
  théorie
Noun
  s'est
  avérée
Verb
  particulièrement
Adverb
  féconde
Adjective
.

This theory proved to be particularly fruitful.
Words and sentences
New
cette

feminine singular of ce

New
théorie

  1. theory
  2. solemn or sacred procession or embassy, especially in ancient Greece
  3. procession; group of people moving in single file; a row, line

New
s'est

se + est (third-person singular indicative present form of être)

New
avérée

feminine singular of avéré

New
particulièrement

  1. particularly, specifically
  2. especially
  3. in particular

New
féconde

feminine singular of fécond

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