To enable sufficient cutaneous respiration, the surface of their highly vascularised skin must remain moist to allow the oxygen to diffuse at a sufficiently high rate.
tʊ ɛnˈeɪbəl səfˈɪʃənt kjuːtˈeɪniəs ɹˌɛspᵻɹˈeɪʃən, ðə sˈɜːfɪs ʌv ðɛɹ hˈaɪli vˈæskjʊlɚɹˌaɪzd skˈɪn mˈʌst ɹᵻmˈeɪn mˈɔɪst tʊ ɐlˈaʊ ðɪ ˈɑːksɪdʒən tə dᵻfjˈuːz æɾə səfˈɪʃəntli hˈaɪ ɹˈeɪt.