Gas exchange can take place through the skin (cutaneous respiration) and this allows adult amphibians to respire without rising to the surface of water and to hibernate at the bottom of ponds.
ɡˈæs ɛkstʃˈeɪndʒ kæn tˈeɪk plˈeɪs θɹuː ðə skˈɪn kjuːtˈeɪniəs ɹˌɛspᵻɹˈeɪʃən ænd ðɪs ɐlˈaʊz ɐdˈʌlt æmfˈɪbiənz tə ɹᵻspˈaɪɚ wɪðˌaʊt ɹˈaɪzɪŋ tə ðə sˈɜːfɪs ʌv wˈɔːɾɚ ænd tə hˈaɪbɚnˌeɪt æt ðə bˈɑːɾəm ʌv pˈɑːndz.