通常情况下，需求会在项目的生命周期内发生变化，即使没有别的原因，交付项目所需的时间也常常会超出业务修改所需的时间。
More often than not, requirements will evolve over the life of the project, if for no other reason than the time it takes to deliver a project often exceeds the time businesses need to make changes.
专家们说，没有理由恐慌，不过注意还是应该的，原因是细菌的传播常常与厕所不干净和人体排泄物中的细菌有关。
Experts say there's no reason to panic — even though there may be good reasons to be grossed out, since the spread of germs is often linked to poor bathroom hygiene and bacteria from human waste.
咀嚼问题常常是夜间磨牙症的一个原因，检查有没有牙齿损伤是个不错的方法。
Bite problems are often a cause of bruxism, and it's a good idea to check for damage to your teeth.
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