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The creation of a labor force that was accustomed to working in factories did not occur easily.

培养一批习惯在工厂工作的劳动力并不容易。

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The challenger contends that ballots marked for Mr.Karzai are arriving from districts where voting did not occur and turnout is being reported as high as 40 percent in areas where only 10 percent of voters cast ballots.

VOA: standard.2009.08.23

And then, of course, not just whether the reaction will occur but, how fast it occurs is really important.

当然，我们不光要研究一个反应会不会发生,反应速率多块也是很重要的研究问题。

麻省理工公开课 - 化学原理课程节选

So, he writes: To the psychologist alone can such questions occur as: Why do we smile when pleased and not scowl?

他这样写到：,对哲学家本身说,会出现这些问题：,为什么开心时我们微笑而非皱眉？

耶鲁公开课 - 心理学导论课程节选

Nontraffic crashes include back-over crashes and single-vehicle crashes that did not occur on a national highway.

FORBES: Magazine Article

Unfortunately, we are just going to have wait and see what does and does not occur.

FORBES: Capital Gains and Dividend Taxes: What's Next

The same dissembling does not occur with the New York Post and its gossip column Page Six.

NEWYORKER: Search and Destroy