It may not seem like a serious problem but persistent grinding and putting pressure on your pearly whites can lead to shortening and ruining of the teeth as well as joint problems later on.

也许那看上去不是什么大问题，但长时间的磨牙、持续对你的一口白牙齿施压会和下面要提的一些问题一样，减少牙齿寿命、破坏牙齿健康。

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Serious eye strain can lead to persistent headaches, muscle pain in the head, neck and upper back, as well as long term problems like myopia.

严重的眼疲劳会导致长期的头痛，头部，颈部和上发背的肌肉疼痛，也可能会引起一个长期的问题近视。

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The adverse impact of persistent organic pollutants, or POPs as many of the pesticides are known, on the environment and health are serious.

有机污染物（或许多被称为POP的杀虫剂）对环境和健康造成严重的持续负面影响。

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"Wherever serious and credible allegations are made of grave and persistent violations of international humanitarian laws, these should be properly investigated,".

VOA: standard.2009.05.19

"The substantial growth in the use of out-of-court disposals has created some disquiet among criminal justice professionals over inconsistencies in their use, in particular for persistent and more serious offending, " said the inspectors.

BBC: Watchdogs criticise out-of-court penalties

These drugs, used for treating patients with severe, persistent pain, provide needed relief for millions but also pose a serious risk of abuse, overdose, and death.

WHITEHOUSE: New Safety Measures for Opioid Medications