原材料引用（Materials）
This is the VOA special English Health Report.
Cardiopulmonary resuscitation or CPR can save someone whose heart has stopped. The condition is called cardiac arrest. The heart stops pumping blood; the person stops breathing. Without lifesaving measures, the brain starts to die within four to six minutes.CPR combines breathing into the victim's mouth and repeated presses on the chest. CPR keeps blood and oxygen flowing to the heart and brain.
However, a new Japanese study queations the usefulness of mouth-to-mouth breathing.The study was published in the British medical magzine, the Lancet.Doctors in Tokyo led the research. It examined more than 4,000 people who had suffered cardiac arrest.In all the cases, witnesses saw the event happen. More than 1,000 of the victims received some kind of medical assistance from witnesses.
信息和事实（Facts）
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感受与评价（Comments）
总说棋到中盘拼持续，不放水，不滑坡。
但说实话，自习这几天的效果不好，好不容易绷起的那一根弦，这几天开始晃悠，练习效果大打折扣。
统计累计的练习小时数（Hours）：1h
