Even a 1% change in flow rate can sometimes be significant, if it is persistent, but that is not always the case.

有时，流速持续不断的改变，即使仅有1%也显得非常重要，但这种情况并不常见。

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The primary reason Gilead was created was to ease the pain that is sometimes incurred when sending persistent entities to other systems or front-end technologies.

创建Gilead项目的主要目的是减轻人们把持久性实体传递到其他系统或者其他技术前端时遇到的痛苦。为什么这个过程那么棘手呢？

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For the longest time, doctors suspected that the condition was caused by persistent, hidden bacterial infections and sometimes prescribed long-term or open-ended antibiotic therapy.

其中维持最长时间的治疗方法是医生怀疑是由于持续的，潜伏的细菌感染，并由此开出长期或者无限期的抗生素药方。

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Symptoms include mild headaches, muscle pain, fever, a persistent cough and sometimes vomiting and diarrhoea.

BBC: Legionnaires' Disease bacteria

The telltale signs of a problem are a fever and persistent pain that's disproportionate to the injury: Sometimes it's "the worst pain they've ever experienced, " he said.

CNN: Surviving a flesh-eating disease

That is not to deny that antitrust action is sometimes right even in high-tech industries: Microsoft's dominance became so large, and so persistent, that it deterred rivals from innovating.

ECONOMIST: Merger regulation