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prototype
mastery UK /ˈpɹəʊtətaɪp/ US /ˈpɹoʊtəˌtaɪp/nounverb
card 1 of 10 · preposition
Engineers built a prototype _____ a new water-filtering system to test before manufacturing.
card 1 of 10 · preposition
Engineers built a prototype _____ a new water-filtering system to test before manufacturing.