This "once in a lifetime" event actually may take place twice in some folks' lives.

这种“生平仅见”的事件实际上有可能在一些人的生活中发生两次。

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Not only did she discover radium but also won the Nobel Prize twice in her lifetime.

她不仅发现了镭，她一生中还获得了两次诺贝尔奖。

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First, if some nodes in your cell are left down for extended periods of time (likely twice the key lifetime), the nodes can lose the ability to communicate.

首先，如果计算单元中的某些节点在一段时间(比如密钥寿命的两倍)内一直停机，它们就会丧失通信能力。

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Mr. HALL: I think that's really an important thing, having been unemployed twice in my lifetime.

NPR: Expert Helps Makes Sense of Stimulus Package

"That kind of stuff only happens to a perfumer once or twice in a lifetime, " said Turin.

CNN: STORY HIGHLIGHTS

Of course selling a fridge once or twice in the lifetime of a consumer is not the high recurrence business model of sugar-water vendors targeting impressionable children and exploiting their apetite for sugar and instant gratification.

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