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And though perseverance can be an admirable trait and is essential for all success in life, when taken too far it becomes perseveration - uncontrollable repetition - or simple perversity.

尽管恒心毅力是个令人羡慕的品质并且是成功必不可少的要素，但是一旦过度它就变成了固执——不可控制的重复——或者简单的坚持。

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The task may be possible for this simple case but it becomes daunting and likely impossible in the general case.

这个任务也许对于这个简单的情况可以实现，但在普遍情况下也许就变的难以实现、让人退缩。

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The AluRack (left) is designed by the famed Jakob Wagner from Denmark, and by securing it onto the back of any aluminum iMac or Cinema Display, it becomes a simple rack and lets you keep your laptop out of sight.

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The trouble is that the longer the puzzle continues, the more potentially worrying it becomes, because it becomes less and less likely that simple measurement error explains it.

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For us that are technical these are relatively simple issues to solve but for people that cannot conceptualize the problem it becomes a disability and can impair the quality of their lives.

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