高可靠扫描部件是星载遥感仪器的关键部件，其可靠性验证试验的试验样本具有“小子样、零失效”的局限。

Highly reliable scanning components play an important role in satellite-borne remote sensing instrument. Their samples of reliability verification test are bound to be small sized and zero-failure.

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星载遥感仪器扫描部件具有“极小子样、零失效”的特点，其可靠性分析与评估一直是工程实践中的技术难题之一。

The reliability and evaluation of Scanning Components for Satellite-borne Instrument is difficult in engineering because of extremely small sized and zero-failure.

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全部缓存失效：在这种情况下，web零售商选择在低负载下定期人工作废全部缓存然后重建。

Full cache invalidation: in this case, the web retailer chooses to periodically manually invalidate the entire cache under load and rebuild it.

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