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imperviousadj USA: ɪ"mpəː'viː·ʌ·s UK: ɪmpəːvɪəs
impervious to waterexp USA: ɪ"mpəː'viː·ʌ·s tʌ· wɔː'təː· UK: ɪmpəːvɪəs tuː wɔːtər
imperviousnessnoun UK: ɪmpəːvɪəsnəs
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