Since these technologies do only utilize one copy of the data, the disk would still be a single point of failure.

由于这些技术只使用一份数据副本，所以磁盘仍然会出现单点故障。

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The residual strength is usually used to measure the fatigue failure, but so much work is needed to do and the cost is high and only one data is acquired for one test-piece.

剩余强度来度量疲劳损伤破坏准则清楚明了，但实验工作量大、费用高，并且一个试件只能得到一个数据；

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