学习材料：
He says this world save lives. Studies show that many people do not want to perform mouth-to-mouth breathing on a stranger for fear of getting a disease. Cardiac arrest kills more than 300,000 people in the United States every year.
感受：
事情要一件件地做，都会做完的。除非你做之前各种想，那最后什么都做不了。
加油，谢谢S
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