No, but they should be conducted much less frequently than most project teams do, especially if the team's roots are in a waterfall type of methodology.

不，但进行的次数应该比大部分项目团队少得多，特别是如果团队的根源是瀑布型的方法。

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Less frequently mentioned, though no less important, is Apple's vast catalogue of television programmes and films, and the infrastructure for delivering them.

同样重要却不常提及的是苹果天量的各类电视节目和影片，及传送它们的基础设施。

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But an extensive U.S. report has concluded that people who have several cups a day fare no worse than those who drink coffee less frequently.

但是美国一个全面的报道总结出，每天喝几杯咖啡的人不会比较少喝咖啡的人过得更糟。

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That's not a problem, Koppula says, because supplemental results are no less legitimate than normal results, and pages in the supplemental index aren't checked any less frequently by Google's spider.

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