乐观主义者也认为坏事只是偶尔意外出现，不是因为人做错了；而且他们相信坏事不可能再次发生。
Optimists also figure that bad things happen occasionally, and by chance, not because of one's own mistakes; and they believe those bad things are unlikely to happen again.
当大型强子对撞器达到它操作的最大限度时——这个月早些时候它为碰撞发生的速度设置了一项新记录——离奇古怪的结果必然会越来越频繁地意外出现。
As the LHC reaches its operational capacity-earlier this month it set a new record for the rate at which collisions occur-curious results are bound to crop up more and more frequently.
安全漏洞是在对安全协议的具体实现中发生的错误，是意外出现的非正常情况。
Security vulnerabilities are on security agreement in the concrete implementation errors, is the accident appear abnormal conditions.
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