"It is almost impossible to separate and identify all the different molecules of bitumen, because the number of molecules with different chemical structure is extremely large".
"ɪɾ ɪz ˈɔːlmoʊst ɪmpˈɑːsᵻbəl tə sˈɛpɚɹˌeɪt ænd aɪdˈɛntᵻfˌaɪ ˈɔːl ðə dˈɪfɹənt mˈɑːlɪkjˌuːlz ʌv bɪtˈuːmɛn, bɪkˈʌz ðə nˈʌmbɚɹ ʌv mˈɑːlɪkjˌuːlz wɪð dˈɪfɹənt kˈɛmɪkəl stɹˈʌktʃɚɹ ɪz ɛkstɹˈiːmli lˈɑːɹdʒ".