1. An explosion will probably occur at any minute.
   炸弹随时可能爆炸。
2. Who was at the helm when the collision occurred?
   当碰撞发生时,谁在掌舵?
3. The word “gratitude” did not occur in his words.
   “感激”两字在他的话中是见不到的。
4. Police said that the blast occurred at 9 a.m.
   警方说这次爆炸发生在上午九点。
5. A seismoscope is an apparatus or device which only indicates that an earthquake has occurred.
   验震器是仅仅指示地震发生的仪器或装置。
6. But the interference fit by hydroform result in the damage occurring on the contact surface.
   然而,由于锥套与辊颈利用液压胀形实现过盈装配,使得接触面间在装配过程中发生表面损伤。
7. Surgery is the only choice of treatment if aspiration pneumonia, mediastinitis or other infections occur.
   一旦病患出现感染症状时，手术治疗是唯一的选择。
8. I hope this won't occur again.
   我希望不要再发生这种事情。
9. Opportunities for learning occur spontaneously every day.
   学习的机会每天都会自然而然地出现。
10. Very often tragedies or near tragedies occurred.
    悲剧或近乎悲剧的事经常发生。
11. A startling cultural transformation occurred in post-war Britain.
    战后英国的文化出现了令人惊讶的变化。
12. It occurred on the morning of the fifteenth.
    事情发生在15号的上午。
13. I hope no accident has occurred to him.
    我希望他没出什么事。
14. A new outbreak of smallpox occurred in 1928.
    1928 年爆发了新一轮的天花。
15. The usual bipyramid-shaped parasporal bodies occur in Lepidoptera-active strains.
    一般双金字塔形伴胞体形成于鳞翅目活性株。
16. Mental and physical deterioration both occur naturally with age.
    随着年龄的增长，心智和体力自然衰退。
17. When melasma occurs, melanocytes in certain areas overproduce melanin.
    当发生黄褐斑，黑色素细胞在某些领域产生过量黑色素。
18. The child's birth occured at 2 a. m.
    这孩子凌晨两点出生。
19. Signomial geometric programming(SGP)problems often occur in engineering design and management.
    符号几何规划(SGP)问题经常出现在工程设计和管理中。
20. Such disparagement of anthropomorphism occurred in the ancient world, too.
    例如，凯尔特人就看不起希腊人的这种做法。

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