霍金是一位身患运动神经元病的理论物理学家，按照他的说法，根本不存在天堂，我们的大脑如同一台计算机，当其部件失效时将会停止运行。
According to Hawking, a theoretical physicist whose body is paralyzed by motor neurone disease, there is no heaven, and our brain is like a computer that will stop working when its components fail.
可通过故障树分析及评估控制系统部件失效所产生的影响，确保始终维持安全状态。
A fault tree can be developed to evaluate the impact of the failure of a control system component and to ensure that safe conditions are maintained.
磨损是造成机械零部件失效的主要原因之一。
Wear is one of the major causes of machinery parts' failures.
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