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New data show that when bystanders without emergency medical training try CPR using only chest compression, the results can be better than if they also attempt mouth-to-mouth. Christopher Intagliata reports 看见身边有人突然倒了， 想救人家

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1849 、 静摩擦 staticfriction 1850 、 颈轴承 journalbearing 1851 、 颈缩 necking 1852 、 频带宽度 bandwidth 1853 、 频率 frequency 1854 、 头座 headstock 1855 、 阈值；临界值

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From VOA Learning English, this is the Health Lifestyle report. Exercise is good for us. It reduces the risks of dying from all causes, including cancer and heart disease. This is according to the World Health Organization. But many people who work a

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From VOA Learning English, this is the Health Lifestyle report. Exercise is good for us. It reduces the risks of dying from all causes, including cancer and heart disease. This is according to the World Health Organization. But many people who work a

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