When exactly did the incident occur?
这一事件究竟是什么时候发生的？
Nitrates are chemicals that occur naturally in water and the soil.
硝酸盐是水和土壤里天然存在的化学物质。
Ulcers occur when the stomach's natural acids eat into the lining of the stomach.
胃酸腐蚀胃壁时，就出现了溃疡。
Within a half-mile from ground zero, death from radiation poisoning will occur within twelve hours.
在核爆点半英里内，辐射中毒引起的死亡会在十二小时内发生。
Frosts often occur in November.
11月份经常出现霜冻。
小心别再发生这种事了！
Where does extreme poverty occur?
极端贫困出现在哪里？
Most volcanoes occur at plate boundaries.
大多数火山的爆发发生在板块边界。
Where did the shark attacks occur recently?
最近的鲨鱼袭击发生在哪里？
Extreme events, however, will continue to occur.
然而，极端事件将继续发生。
Very rarely did any violent crimes actually occur.
暴力犯罪实际上很少发生。
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？
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？
How can volcanic activity occur so far from a plate boundary?
火山活动是如何在离板块边界那么远的地方发生的呢？
The coughing with asthma can occur during the day or at night.
哮喘咳嗽可发生在白天或晚上。
If Dollo's law is right, atavisms should occur only very rarely.
如果多洛定律是正确的，返祖现象应该很少发生。
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。
This was to occur with progress in the development of the steam engine.
这是随着蒸汽机的发展进步而发生的。
Exclusive care by the male parent is much less common, but it does occur.
由男性家长单独照顾的情况要少得多，但这种情况确实存在。
Additional social stresses may also occur because of the population explosion.
人口激增可能会导致其他社会压力出现。
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。
Hand collecting consists of searching for ants everywhere they are likely to occur.
手工收集是指在蚂蚁可能出现的任何地方寻找它们。
Besides these symptoms of altitude sickness, others such as headache and fatigue may also occur.
除了这些症状外，高原反应还可能出现头痛和疲劳等其他症状。
It didn't occur to her to ask for help.
她没想到请别人帮忙。
No one has suggested how this might occur.
没有人提议过这事如何开始。
It did not occur to me to check my insurance policy.
我没想到要核对我的保险单。
About two in every five epileptic fits occur during sleep.
每五例癫痫昏厥中，约有两例是在睡眠中发作的。
It didn't occur to him that his wife was having an affair.
他没有想到自己的妻子有婚外情。
By noticing these changes, the woman can tell when ovulation is about to occur.
通过观察这些变化，这名妇女能判断出何时排卵。
Most avalanches occur long before this happens.
大多数雪崩在这之前就发生了。
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