原材料引用（Materials）：
It said people should increase the number of chest presses fromfifteentothirtyfor every two breaths given.
Gordon Ewy is a heart doctor at the University of Arizona College of Medicine in Tucson.
He wrote a report that appeared with the study.
ɪt sɛd ˈpipəl ʃʊd ˈɪnˌkris ðə ˈnʌmbər ʌv ʧɛst ˈprɛsəz frʌm fɪfˈtin tu ˈθɜrdi fɔr ˈɛvəri tu brɛθs ˈgɪvən.
ˈgɔrdən ˈevi ɪz ə hɑrt ˈdɑktər æt ðə ˌjunəˈvɜrsəti ʌv ˌɛrɪˈzoʊnə ˈkɑlɪʤ ʌv ˈmɛdəsən ɪn ˈtuˌsɑn.
hi roʊt ə rɪˈpɔrt ðæt əˈpɪrd wɪð ðə ˈstʌdi.【Comments】感受与评价
有时候练着练着不该卷的就卷了，该卷的就没卷，要么就[ð]和［θ］忘了咬舌头，一直练就对了，加油，不放弃。
