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has been synthesizing

  • present perfect progressive
    of synthesize (3rd person singular).
    synthesize
    verb (used with object)
    to form (a material or abstract entity) by combining parts or elements (opposed to analyze).

Example Sentences

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But Mother Nature has been synthesizing weird and wonderful medicinal chemicals for over three billion years, many of which chemists could not predict or devise in their wildest dreams.

From New York Times Oct. 2, 2020