A third type of mountain may be formed as a result of volcanic activity which occurs in regions of active fold mountain belts, such as in the Cascade Range of western North America.

第三种类型的山可能是由于火山活动形成的，一般发生在活动性褶皱带地区，如北美西部的喀斯喀特山脉。

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Spinning down the hard disk and setting a reduced CPU speed setting can be performed for any time range when the CPU and disk activity is below a set threshold.

让硬盘停转并且降低CPU速度可以在CPU及磁盘活动低于设定阈值的任何时间范围内执行。

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Young stars are usually excluded from planet searches because they have intense magnetic fields that generate a range of phenomena known collectively as stellar activity, including flares and spots.

搜寻行星时通常把年轻的恒星排除在外，因为它们有强烈的磁场，会产生包括耀斑在内的恒星磁活动，这使得天文学家很难分辨行星和活动信号。

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Pfizer ( PFE - news - people ): Long-term options activity on the pharmaceutical giant indicates some strategists expect shares in Pfizer to remain range-bound through June 2011 expiration.

FORBES: Bulls Swing For The Fences With Priceline, Silver Wheaton

Levels of flu-like illness were said to be "within the usual seasonal activity range" but were "higher than Wales has experienced in recent years".

BBC: GPs report small rise in number of flu patients

REV, for example, can trigger the activity of cancer-promoting genes and, as a consequence, it causes a wide range of gallinaceous tumours.

ECONOMIST: Foulpox