occur的例句

1. When exactly did the incident occur?: 这一事件究竟是什么时候发生的？

2. 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。

3. 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。

4. 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。

5. 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。

6. 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。

7. 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。

8. 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。

9. 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。

10. 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。

11. Frosts often occur in November.: 11月份经常出现霜冻。

12. Mind it doesn't occur again!: 小心别再发生这种事了！

13. Where does extreme poverty occur?: 极端贫困出现在哪里？

14. Most volcanoes occur at plate boundaries.: 大多数火山的爆发发生在板块边界。

15. Where did the shark attacks occur recently?: 最近的鲨鱼袭击发生在哪里？

16. Extreme events, however, will continue to occur.: 然而，极端事件将继续发生。

17. Very rarely did any violent crimes actually occur.: 暴力犯罪实际上很少发生。

18. 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？

19. 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？

20. The time when a solar eclipse will occur can be calculated.: 日食发生的时间可以推算出来。

21. 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？

22. 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。

23. They're more likely to occur in societies that frown on porce.: 这种关系更可能存在于反对离婚的社会中。

24. Why did the near extinction and migrations of wild animals occur?: 为什么会发生野生动物濒临灭绝和迁徙的现象？

25. 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。

26. 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”。

27. 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。

28. Bombings and shootings occur almost daily in Thailand's three southernmost provinces.: 在泰国最南部的三个省份，爆炸和枪击事件几乎每天都在发生。

29. 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。

30. It didn't occur to her to ask for help.: 她没想到请别人帮忙。

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