It occurs in elderly men, apparently as part of the aging process.

作为衰老进程的一部分，它明显发生在老年男性身上。

《柯林斯英汉双解大词典》

In the Chinese calendar, the Spring Equinox always occurs in the second month.

在中国历法中，春分总是出现在二月份。

《柯林斯英汉双解大词典》

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Sudden heart failure occurs in approximately one out of 100,000 students each year.

VOA: standard.2009.12.12

Well, that process occurs in a series of steps and one of those kinds of steps is shown here.

这个过程的发生包含一系列步骤,而这些步骤中的一个步骤即如图所示

耶鲁公开课 - 生物医学工程探索课程节选

Fertilization of these two where these two cells join occurs in the distal part of the fallopian tube.

受精的过程,就是这两种细胞,在输卵管壶腹部相互结合

耶鲁公开课 - 生物医学工程探索课程节选

What will our government do if a double-dip recession occurs in the near future?

FORBES: U.S. Debt Bomb's Detonation Sped Up By Five Years

Natural radioactivity even occurs in foods such as carrots and bananas, and in beer.

WSJ: Radiation's Effect Depends on Amount

Meanwhile, the rotation that occurs in that post relative to other C-level executives continues.

FORBES: CMO Tenure Reaches 45 Months