游戏结束：PlayStation网络，这个允许玩家在线玩游戏的网络周四宕了整整一天，并预测该网周五仍将会离线。
Game off: The PlayStation Network, which allows gamers to play online was down all day Thursday and predicted it would be offline on Friday.
该方法的缺点在于离线实验只能评测一个很狭窄的数据集切面，主要是关于算法预测或者评估的准确性。
The downside is that off-line experiments can evaluate a narrow set of aspects, primarily about algorithms prediction or recommendation accuracy.
同时保存下来的数据可以用于离线分析，有利于对故障规律进行研究和预测，对日后的电网设计和保护设备配置提供参考。
At the same time the data kept can be used in off-line analysis, help to research and predict the fault law and offer reference to design the power net and dispose the protect device in the future.
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