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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The reason is its dominant position as a search engine – a key activity – and in selling adverts against search ("AdWords") and web pages ("AdSense"), which is how it makes money.

理由是它的主导地位在搜索引擎方面--一个重要的上网活动--而且在它通过卖广告给搜索（AdWords）和卖广告给网页（AdSense）的赚钱的方式。

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From the point of view of this paper, the education value should be dominant in the value system of discipline practice which can be defined as an educational activity.

本文所要陈述的基本观点是：纪律实践是一种教育活动，在其具有的多种价值所构成的价值系统中，育人价值应该具有主导地位。

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Locals and visitors alike flock to the beach, especially on weekends when the dominant activity is wiling away the day by the ocean.

BBC: A seaside taste of Rio de Janeiro