When exactly did the incident occur?
这一事件究竟是什么时候发生的？
These snails do not occur on low-lying coral islands.
这些蜗牛不会出现在低洼的珊瑚岛上。
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。
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。
Such events occur only when the external conditions are favourable.
此类事件只有当外界条件有利时才会发生。
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。
If headaches only occur at night, lack of fresh air and oxygen is often the cause.
如果头痛只发生在晚上，缺少新鲜空气和氧气常常是其原因。
If the climate gets drier, then the logical conclusion is that even more drought will occur.
如果气候变得更干燥，那么符合逻辑的结论就是甚至更多的旱灾将会发生。
Scientists warned that emergency cooling systems could fail and a reactor meltdown could occur.
科学家们警告说紧急冷却系统可能失灵，核反应堆的堆芯熔毁可能会发生。
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。
Crater cracks occur when a crater is not filled.
当火山口没有被填满时，就会出现火山口裂缝。
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？
When these side effects occur, they are called adverse reactions.
当这些副作用发生时，它们被称为不良反应。
When these side effects occur, they are called "adverse reactions".
当这些副作用发生时，它们被称为“不良反应”。
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。
Additional breathing changes occur during REM sleep that are even more dramatic than the changes that occur during NREM.
在快速眼动睡眠期发生的额外的呼吸变化，甚至比那些在非快速眼动期发生的变化还要显著。
It didn't occur to her to ask for help.
她没想到请别人帮忙。
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