An adult male lion is resting in the grass on the Kenyan savanna.

肯尼亚热带草原上，一头成年雄狮正在草丛里休息。

The herders shifted south, following the major river systems into savanna regions.

牧民们向南迁移，沿着主要河流系统进入热带草原地区。

Increase in pastureland and subsequent overgrazing have resulted in an expansion of savanna.

草场的增加和随之而来的过度放牧导致了稀树草原的扩张。

In many characteristics, savanna soils are similar to those of some rain forests, though more extreme.

稀树草原的土壤与一些热带雨林的土壤有许多相似的特征，尽管会更极端。

In the book "Secrets of the Savanna", they issued a strong call that Africa should control its population.

在《稀树大草原的秘密》一书中，他们发出了非洲应当控制人口的强烈呼唤。

We are, after all, only creatures of the African savanna, programmed to uncover trends in the natural world.

我们终归只是来自非洲草原的生物，有计划的掩盖着自然界的发展趋势。

Overlooking the zebra antelope roam free on the private balcony, and take in the views of the 33-acre savanna.

在私家阳台上俯瞰斑马羚羊自由漫步，33英亩的热带草原风光尽收眼底。

There is generally little doubt that fire is a significant factor in maintaining savanna, certainly in most regions.

火灾是维持稀树草原的一个重要因素，在大多数地区都是如此，（人们）对此通常很少有疑问。

As they travel inland at speeds in excess of 60 feet a year, they merge with the rich grass and scattered trees of the savanna.

它们以每年超过60英尺的速度向内地迁移，融入了热带稀树大草原的丰富草地和零星的树木。

Many savanna and dry-forest plant species are called pyrophytes, meaning they are adapted in various ways to withstand occasional burning.

许多热带稀树草原和干森林植物物种被称为火生植物，这意味着它们以各种方式形成适应性，以抵御偶尔的燃烧。

On certain sites, particularly in South America, savanna formation seems related to frequent cutting and burning of moist forests for pastureland.

在某些地方，特别是在南美洲，稀树草原的形成似乎与频繁地砍伐和焚烧潮湿的森林作为牧场有关。

There is no simple or single factor that determines if a given site will be a savanna, but some factors seem to play important roles in their formation.

没有什么简单或单一的因素能决定一个给定的地点是否会成为热带草原，但部分因素似乎在热带草原的形成中扮演着重要的角色。

Though plenty of rain may fall on savanna during the year, for at least part of the year little does, creating the drought stress ultimately favoring grasses.

尽管一年中大草原上可能会有大量降雨，但至少有一段时间是降雨很少的，造成干旱压力，最终有利于牧草生长。

One theory behind savanna formation is that wet forest species are unable to withstand the dry season, and thus savanna, rather than rain forest, is favored on the site.

热带草原形成的理论之一，就是湿润的森林物种无法承受旱季，因此这更有利于热带草原，而不是热带雨林的形成。

Once the humus layer disappears, nutrients cannot be recycled and leach from the soil, converting soil from fertile to infertile and making it suitable only for savanna vegetation.

一旦腐殖质层消失，养分就无法从土壤中回收和过滤，致使土壤由肥沃变为贫瘠，只适于热带草原植被的生长。

Savanna wants kids to be healthy, so they can have happy lives.

萨瓦纳希望孩子们健康，这样他们就能过上幸福的生活。

In these areas, rainfall per month exceeds that in the above definition, so other factors must contribute to savanna formation.

在这些地区，每个月的降雨量超过了上述定义中的量，所以一定有其他因素促成草原的形成。

South of the equatorial region is the tree-dotted grassland called the savanna.

赤道以南是树木点缀的草原，称为热带稀树草原。

A mature male lion rests in the grasses of the Kenyan savanna.

肯尼亚热带草原上，一头成年雄狮正在草丛里休息。

Greater rheas graze in the tall savanna grass of Brazil's Pantanal.

在巴西的潘塔纳尔稀树草原上，生活着一种体态较大的美洲驼鸟。

One holds that the African climate dried out and forests turned into savanna.

一种观点认为，非洲的气候变得干燥起来，驱赶他们离开森林进入热带草原。

Players simply observe wild animals in the savanna and take virtual photos.

玩家只是在热带草原上观察野生动物，然后拍些虚拟照片。

Burns keep the grassland fertile and prevent woody plants from encroaching on the savanna.

烧火不但可以使草原肥沃起来，而且还能防止木本植物侵入草原。

In "Secrets of the Savanna" they issued a strong call for human population control in Africa.

在《稀树大草原的秘密》一书中，他们发出了非洲应当控制人口的强烈呼唤。

This is Myotis tricolor, a relatively common savanna species that is widespread across Africa.

上图是一只南非鼠耳蝠，是一种在相对普遍的热带稀树草原物种，广泛分布于非洲。