The fight may end up harmless, but sometimes also very brutal.

战斗可能以无害的方式结束，但有时也可能非常残暴。

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Fact: Snoring may be harmless, but it can also be a symptom of a life-threatening sleep disorder called sleep apnea, especially if it is accompanied by severe daytime sleepiness.

事实：打鼾可能是无害的，但它也可以是威胁生命的睡眠障碍的一个症状，这一睡眠障碍叫做“睡眠呼吸暂停”，特别是当它伴有严重的白天的嗜睡症状的时候。

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This will result in PHP reporting a warning every time an uninitialized variable is used, each bad file access, and other (mostly) harmless errors, but might also represent a potential attack vector.

设置更改后，每当使用未初始化的变量、进行错误的文件访问及发生其他（大多数）无害错误时，PHP 都会报告一条警告消息，但也存在这是一个潜在攻击矢量的可能性。

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"The stuff on the beach is harmless, but the Facebook entry also had address and personal information and that is a very different thing, " said Mr Black.

BBC: Security risks of social networks