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. 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。
5. Police said that the blast occurred at 9 a.m.
   警方说这次爆炸发生在上午九点。
6. At Scinto 6 uranium occurs in much altered dolerite below the unconformity.
   “辛托6”的铀矿体产于不整合面之下变质甚深的粒玄岩中。
7. It occurs to me that example is always more efficacious than precept.
   我想到身教重于言教。
8. Rubral tremor is a rare movement disorder that occurs typically with midbrain damage.
   摘要红核颤抖症是一种少见的运动疾患，它的发生通常和中脑的病变有关。
9. If urethral obstruction occurs, congenital megaurethra is lethal without patent urachus or rectoesical fistula.
   如果存在尿道梗阻，先天性巨尿道即便没有脐尿管未闭或直肠膀胱瘘也是致死性的。
10. Rocky Mountain spotted fever is a rickettsial disease that occurs in dogs and humans.
    犬落基山斑疹热是一种人犬共患的立克次体病。
11. 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。
12. Pyrite is more abundant and cobaltiferous and occurs in heavy patches in the sulfide mass.
    黄铁矿很多，并且含钴，在硫化物块体中成稠密的斑块。
13. 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。
14. Salt occurs naturally in sea water.
    盐天然存于海水中。
15. Dueling occurs in his writings passim.
    决斗在他的作品中到处可见。
16. I hope this won't occur again.
    我希望不要再发生这种事情。
17. Opportunities for learning occur spontaneously every day.
    学习的机会每天都会自然而然地出现。
18. Very often tragedies or near tragedies occurred.
    悲剧或近乎悲剧的事经常发生。
19. 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。
20. It occurred on the morning of the fifteenth.
    事情发生在15号的上午。

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