Rattlesnakes occur in the warmer, drier parts of North America.
响尾蛇出现在北美温暖干燥的地区。
Waterlogged soils occur in areas that are flat or have poor drainage.
涝渍土壤发生在地势平坦或排水不畅的地区。
Changes in the eccentricity of Earth's orbit occur in a cycle of about 96,000 years.
地球轨道偏心率的变化大约在96000年的一个周期内发生。
Solar storms aimed at Earth come in three stages, not all of which occur in any given storm.
扑向地球的太阳风暴分三个阶段，但并不是所有的阶段都发生在特定的风暴中。
Occasionally, the "herald patch" may occur in a hidden position (armpit, for example) and not be noticed immediately.
有时，“母斑”会发生在隐秘的部分（例如腋窝）并且不能马上被发现。
The question about the rate of evolution must now be turned around: does evolution ever proceed gradually, or does it always occur in short bursts?
关于进化速度的问题现在必须解决：进化是逐步进行的，还是总在短时间内发生？
These studies suggest that choice blindness can occur in a wide variety of situations and can have serious implications for medical and judicial outcomes.
这些研究表明，“选择盲”这一病症可以发生在各种各样的情形下，并可能对医疗和司法结果产生严重影响。
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。
Most volcanoes that occur in the interiors of plates are believed to be produced by mantle plumes, columns of molten rock that rise from deep within the mantle.
人们认为，大多数发生在板块内部的火山爆发都是由地幔柱造成的，地幔柱是指从地幔深处涌出的熔岩柱体。
Such sentences do not always occur in thinking, and when they do they are merged with vague imagery and the hint of unconscious or subliminal activities going on just out of range.
这样的句子并不总是出现在思维中，即使出现了，它们也会与模糊的意象和无意识或潜意识活动的暗示混杂在一起。
For such reasons, we can assume that there must be an important random factor in neural development, and in particular, that errors must and do occur in the development of all normal brains.
基于这些原因，我们可以假设在神经发育过程中一定存在一个重要的随机因素，特别是在所有正常大脑的发育过程中确实也会发生错误。
Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively in cognitive areas such as attention and memory.
研究人员已经证实，当人们动脑筋时，大脑中会发生生化变化，使其在注意力和记忆等认知区域更有效地发挥作用。
When it comes to hip fractures, the most dangerous place for elderly Americans, it turns out, is their homes; nearly 60% of these dangerous spills will occur in or around the patient's domicile.
说到髋部骨折，对美国老年人来说，最危险的地方原来是他们的家；近60%的摔倒危险会发生在患者住所内或周围。
High levels of nitrate occur in the Midwest because of the heavy use of fertilizers.
因为大量使用化肥，中西部地区的硝酸盐含量很高。
Experiments suggest that if fire did not occur in savannas in the Americas, species composition would change significantly.
实验表明，如果美洲稀树大草原没有发生火灾，物种组成将发生显著变化。
The same minerals that occur in refractory inclusions are believed to be the earliest-formed substances to have condensed out of the solar nebula.
难熔的内含物中的那种矿物质，也被认为是最早形成的太阳星云凝结的物质。
But the ones synthesized through abiotic processes, which is to say not involving microorganisms, occur in equal numbers of right- and left-handed.
但是通过非生物过程合成的，也就是不涉及微生物的那些，在右撇子和左撇子中数量是相等的。
It may be biological processes that occur in the soil in the winter, that cause increased shrub growth in the summer, and here's how: there are "microbes", microscopic organisms that live in the soil.
可能是冬季土壤中发生的生物过程，导致夏季灌木生长增加，原因如下：有“微生物”，即生活在土壤中的微生物。
Non-stoichiometric defects often occur in transition-metal compounds.
非化学计量的缺陷常常出现在过渡金属的化合物中。
Headaches, backache and other pains, light-headedness, jerks and tremors all occur in totally healthy persons.
像头痛、背痛和其他疼痛、头晕、肌肉抽搐、痉挛性震颤等，都是完全健康者也可能发生的。
A lot of concepts inevitably occur in 700 + pages.
许多概念不可避免地出现在700页以后。
Most malaria cases and deaths occur in sub-Saharan Africa.
多数疟疾病例和死亡发生在撒哈拉以南非洲地区。
It can also occur in the elderly and hospitalized patients.
它也会发生在上了年纪的人和住院病人身上。
It is unclear if cases of yaws still occur in the Americas.
目前不清楚美洲是否仍存在雅司病病例。
Enumerated values must occur in elements, not attributes.
必须在元素中而不是在属性中设置枚举值。
This radioactive form of nitrogen does not occur in nature.
氮的这种放射性形式在自然界中不会产生。
One such discovery is that spindle cells occur in nonhumans.
其中一个发现是在非人类上有梭形细胞。
For seasonal influenza, around 90% of deaths occur in the elderly.
90%以上的季节性流感死亡病例发生在老人中。
It also ensures that all the updates occur in a single transaction.
它还确保所有更新发生在同一个事务中。
Currently, about 74% of measles deaths globally occur in South Asia.
目前，全球约74%的麻疹死亡发生在南亚。
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