约翰逊教授，昨天晚上我对我的论文做最后的润色时，电脑发生故障，我的文件全被清除了。你能不能再给我一天时间，把它重新打一遍？
Professor Johnson, last night when I was putting the finishing touches on my paper, a computer failure completely wiped out my files, do you think I can have another day to retype it?
对于铁路操作人员，在故障发生之前预测它的能力将具有无可估量的价值。
For a railway operator, the ability to predict a failure before it happens would be tremendously valuable.
这个日志对故障恢复也很有用：如果元数据服务器发生故障，它的日志就会被重放，保证元数据安全存储在磁盘上。
The journal is also useful for failure recovery: if the metadata server fails, its journal can be replayed to ensure that metadata is safely stored on disk.
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