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mastery UK /ˈpɹəʊtətaɪp/ US /ˈpɹoʊtəˌtaɪp/nounverb
card 1 of 10 · fill in the blank
The new smartphone remains in the prototype _____ and won't be available to consumers until next year.
card 1 of 10 · fill in the blank
The new smartphone remains in the prototype _____ and won't be available to consumers until next year.