X-rays can be passed through the body and used in medical radiography and fluoroscopy to differentiate interior structures that have varying degrees of opaqueness.
ˈɛksɹˈeɪz kæn biː pˈæst θɹuː ðə bˈɑːdi ænd jˈuːzd ɪn mˈɛdɪkəl ɹˌeɪdɪˈɑːɡɹəfi ænd flʊɹɹˈɑːskəpi tə dˌɪfɚɹˈɛnʃɪˌeɪt ɪntˈɪɹiɚ stɹˈʌktʃɚz ðæt hæv vˈɛɹiɪŋ dᵻɡɹˈiːz ʌv oʊpˈeɪknəs.