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.

?t s?d ?pip?l ??d ??n?kris e? ?n?mb?r ?v ??st ?pr?s?z fr?m f?f?tin tu ?θ?rdi f?r ??v?ri tu br?θs ?g?v?n.

?g?rd?n ?evi ?z ? hɑrt ?dɑkt?r ?t e? ?jun??v?rs?ti ?v ??r??zo?n? ?kɑl?? ?v ?m?d?s?n ?n ?tu?sɑn.

hi ro?t ? r??p?rt e?t ??p?rd w?e e? ?st?di.【Comments】感受與評價

有時候練著練著不該卷的就卷了，該卷的就沒卷，要么就[e]和［θ］忘了咬舌頭，一直練就對了，加油，不放棄。