当故障持续时间大于三路时钟相位差时使两路时钟同时采样到故障值，在反馈型电路会导致长时间的故障状态。
When fault duration is longer than phase difference will result in fault sampling by two registers and make feedback circuit in fault state for a long time.
最近S3经历了一次严重的故障。故障发生在S3分处不同地理位置的三个据点中的一个，持续时间超过两小时。
The outage occurred in one of S3's three geographical sites and lasted a little over two hours.
第一类瞬时故障具有这样的性质，其持续时间一旦超过某一界限即引起系统故障。
Type I transient faults include those which lead immediately to system failures once their time duration exceeds some specified limit.
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