Many species are similar enough that hybrid offspring are possible and may often occur in nature, but for the majority of species, this rule generally holds.
许多物种非常相似，因此有可能杂交繁衍出后代，而且这种情况可能经常在自然界中发生；但对于大多数物种来说，这一规则大体适用。
In concrete construction, quality defects may often occur. The causes of some common defects and control of them are discussed.
混凝土工程施工时，经常发生一些质量问题，文章就从质量通病的产生原因和防治方面进行了一些探讨。
An episode of major depression may occur only once in a person's lifetime, but more often, it recurs throughout a person's life.
重度抑郁发作可能在一个人的一生中仅出现一次，但更经常的是，它在一个人的一生中反复出现。
Exposures to odors in natural environments often occur over far longer periods, and the resulting adaptations may differ qualitatively from short-term olfactory adaptation.
在自然环境中暴露于气味通常会持续更长的时间，并且所产生的适应性可能与短期嗅觉适应性在质量上有所不同。
Finding and containing the last remaining cases may be the most difficult stage of the eradication process as cases usually occur in remote often inaccessible rural areas.
发现并且控制最后的剩余病例可能是疾病消灭过程中最为困难的阶段，这是由于这类病例通常出现在偏远并且往往难以进入的农村地区。
Diarrhea may occur around the impaction and often with fecal incontinence.
在粪块嵌塞期间可发生腹泻，并常有大便失禁。
While risk assessment should be done periodically every three years, risks may need to be reassessed more often if the following conditions occur.
应该每三年进行一次风险评估。
Although it may occur in these clearly separable phases, more often it does not.
虽然可能是以这些明确分割阶段的方式发生，不过更多的时候并非如此。
In addition, people with either type of CD may have other symptoms. These symptoms, however, occur much more often in multicentric than in localized Castleman disease.
另外，任何一型的CD都可能有其他的一些症状。尽管这些症状多表现在多种心cd非局限性CD。
Leg cramps generally occur, often in a time of rest or sleep, such as cold, calcium deficiency, osteoporosis may cause.
一般人发生腿抽筋，往往是在休息甚至睡眠的时候出现，比如受凉、缺钙、骨质疏松都可能引起。
Bronchitis and emphysema may occur separately but often occur together.
支气管炎和肺气肿可能个别发生，但通常会一起发生。
Well, for once it may pass; but please not to let the circumstance occur too often.
好吧，这一次就算了，但是请不要让这种情况经常发生。
American students, in particular, are often eager to move off campus as soon as they can. This may occur as early as the sophomore year at most American colleges.
尤其是美国的学生，只要可能便马上搬出校园，在大多数的美国校园中，这种情况在大二时便早早出现。
Insomnia and nervousness (trouble falling asleep or waking often during the night) -may occur during the first few weeks but often subside over time or if the dose is reduced.
失眠和神经质(入睡困难或经常在夜间醒来)，可能发生在头几个星期，但往往随着时间的推移减弱，或如果剂量减少。
Insomnia and nervousness (trouble falling asleep or waking often during the night) -may occur during the first few weeks but often subside over time or if the dose is reduced.
失眠和神经质(入睡困难或经常在夜间醒来)，可能发生在头几个星期，但往往随着时间的推移减弱，或如果剂量减少。
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