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1·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。《牛津词典》

2·Does it look like something might occur in nature?

这看起来像是会在自然界里发生的吗？

3·Does it look like something that might occur in nature?

这看起来像自然界中可能存在的事物吗？

4·They're more likely to occur in societies that frown on divorce.

这种关系更可能存在于反对离婚的社会中。

5·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。

6·They occur in separate zones in a complex glass flow driven by high temperatures.

在高温驱动的复杂玻璃流中，它们出现在不同的区域。

7·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。

8·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。

9·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。

10·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？