The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation.

在半干旱地区，草地通常是最主要的天然植被，而该地区主要的经济活动是家畜饲养。

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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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The next level of detail is selecting the activity type.

第二层的细节是选择活动类型。

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That is the type of activity needed to break the logjam in the credit markets.

FORBES: Credit Crisis

Users then input contextual data tags like time of day, type of activity and the surrounding environmental conditions to allow them to track variables that may affect their focus.

ENGADGET

The British Heart Foundation (BHF) advises that moderate intensity aerobic activity is the most effective type of activity for maintaining a healthy heart.

BBC: Quarter of adults walk just an hour a week, survey finds