铁路信号中的可编程电子系统（PES）是一种安全相关系统。 这类系统更注重失效-安全，而不仅仅是可靠性或可用性。

Programmable electronic system (PES) used in railway signaling is a safety related system, which lays more stress on the ability of fail safe, not merely on the reliability or availability.

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相反，他把这一案例描述成“健康和安全措施的完全失效”的一个例子。

Instead he describes the case as an example of a "total failure in health and safety procedures".

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这会产生大量的放射性气体和颗粒，如果第一层和第二层安全壳都失效的话，大量放射性气体便会泄漏到外界。

Then you have a huge amount of radioactive gases and particles, and if the primary and secondary containment fails, you have a large amount of radioactive gases escaping into the environment.

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