An explosion will probably occur at any minute.

炸弹随时可能爆炸。

Police said that the blast occurred at 9 a.m.

警方说这次爆炸发生在九点。

Who was at the helm when the collision occurred?

当碰撞发生时,谁在掌舵?

The word “gratitude” did not occur in his words.

“感激”两字在他话中见不到。

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，手术治一选择。

A seismoscope is an apparatus or device which only indicates that an earthquake has occurred.

验震器仅仅指示地震发生仪器或装置。

I hope this won't occur again.

我希望不要再发生这种事情。

Opportunities for learning occur spontaneously every day.

习机会每天都会自然而然地出现。

Very often tragedies or near tragedies occurred.

悲剧或近乎悲剧事经常发生。

It occurred on the morning of the fifteenth.

事情发生在15号。

I hope no accident has occurred to him.

我希望他没出什么事。

A new outbreak of smallpox occurred in 1928.

1928 年爆发了新一轮天花。

A startling cultural transformation occurred in post-war Britain.

战后英国文化出现了令人惊讶变化。

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。

The child's birth occured at 2 a. m.

这孩子凌晨两点出生。

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。

Mental and physical deterioration both occur naturally with age.

随着年龄增长，心智和体力自然衰退。

Such disparagement of anthropomorphism occurred in the ancient world, too.

例如，凯尔特人就看不起希腊人这种做法。

Hypnagogic hallucinations may occur in this state, especially auditory ones.

由于造梦者而且确仍然身处梦中，这个现象被称为「假清醒」。

Didn't it occur to you to close the window?

难道你没有想到去关窗户吗?