While this is a single occurrence in this sample, for sizing purposes, you should determine how often these tasks run during prime shift.

虽然在这个示例中只出现了一次，但为了分级目的，您应该确定这些任务在主要班次期间的运行频率。

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In many companies, this is a frequent occurrence, so you should prepare for this situation.

在很多公司中，经常发生这种情况，因此您需要为此做好准备。

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For instance, whales and dolphins have been found in nature with hind limbs; this rare occurrence is due to the reemergence of a trait they inherited from their terrestrial ancestors.

比如说，鲸和海豚身上有后肢；这种稀有的现象是由于它们在陆地上的祖先身上的特征再次被遗传。

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Pandya says this is a common occurrence in Eastern European countries.

VOA: standard.2009.08.21

This gives us a certain advantage in being able to deal with this unprecedented occurrence during the last month.

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"The district has undertaken a review of its practices in an effort to avoid a re-occurrence of this circumstance, " they said in the statement.

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This type of HIV infection hadn't happened in 21 years, so this was a very rare occurrence.

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