Passive attacks: release of message contents and traffic analysis.
被动攻击：消息内容和流量分析释放。
Availability is assured at the operating system level, allowing for transparent mitigation of active and passive network denial-of-service attacks.
它在操作系统级确保可用性，可以透明地缓解主动和被动网络拒绝服务攻击。
"I see a lot of people with heart attacks in their 40s and 50s, who have no risk factors at all except having exposure to passive smoke in childhood," Prof Celermajer says.
“我见过很多四五十岁的心脏病病例，他们除了在幼时曾暴露于二手烟雾，找不到其他导致心脏病的危险因素。”斯里马杰教授说。
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