Typically, the number of active service class periods in a system should not exceed 30.

通常，系统中的活动服务分类周期的数量不应该超过30。

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For example, recently I was asked how to print a certain number of dots (periods) where the number to print wasn't known at compile time.

比如，最近有人问我如何输出在编译时不知道数量的点(句点)。

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Our dealerships havereceived a significantly higher number of orders in December of 2010, farexceeding the normal rate in previous periods.

我们的经销商已经在2010年12月份收到相当多的购车订单 销售量远超于前一段时间的正常销量.

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Drinking large amounts of alcohol over long periods of time has also been linked to a number of cancers.

VOA: special.2009.09.08

The move comes despite Dumfries and Galloway having had record rainfall during a number of periods last year.

BBC: Drought concern follows Dumfries and Galloway dry spell

The report found that there was progress towards abolishing the death penalty in all regions of the world, despite a number of countries resuming executions after periods of not carrying them out.

BBC: Death penalty 'becoming thing of the past', says Amnesty

In addition to a chart that compares FBIOX to health care and the MSCI World Index, it also provides the performance for a number of different time periods, as well as how the fund performed relative to other similar funds or benchmarks.

FORBES: Learn To Drive Your Own 401k