稀树草原通常经历一个相当漫长的旱季。
Savannas typically experience a rather prolonged dry season.
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。
Increase in pastureland and subsequent overgrazing have resulted in an expansion of savanna.
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 many characteristics, savanna soils are similar to those of some rain forests, though more extreme.
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。
There is generally little doubt that fire is a significant factor in maintaining savanna, certainly in most regions.
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。
On certain sites, particularly in South America, savanna formation seems related to frequent cutting and burning of moist forests for pastureland.
在北卡罗莱纳州的松树稀树草原上，对火灾增长的抑制使得其他植物生长过快，在它们的自然环境中胜于捕蝇草。
In the pine savannah of North Carolina, the increasing suppression of fires is allowing other plants to grow too quickly and out compete the flytraps in their native environment.
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。
Many savanna and dry-forest plant species are called pyrophytes, meaning they are adapted in various ways to withstand occasional burning.
"热带稀树草原位于热带地区，海拔较低，是一种稳定的生态系统，由广阔的草地和稀疏分布其中的树木或灌木组成，有些地区湿润，有些地区干燥。
Located in tropical areas at low altitudes, savannas are stable ecosystems, some wet and some dry consisting of vast grasslands with scattered trees or shrubs.
赤道以南是树木点缀的草原，称为热带稀树草原。
South of the equatorial region is the tree-dotted grassland called the savanna.
想象一下我们早先的祖先在稀树草原寻找食物。
Imagine our early ancestors roaming the savannah looking for food.
稀树草原气候的特征是干湿分明，干旱月份多于湿润月份。
Contrasting seasons of rain and drought characterize the savanna climate, typically with more dry months than wet.
在稀树草原 ，非洲有很多有趣的动物 。
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。
Greater rheas graze in the tall savanna grass of Brazil's Pantanal.
全世界过半的稀树草原都在非洲，但在南美，亚洲，澳洲也有分布。
More than half of the world's savanna area is in Africa, but South America, Asia, and Australia also have these habitats.
气温变凉，大地变干，热带稀树草原开始形成，森林渐渐缩。
Temperatures cooled and the land became dries. Savannas were forming and forests were shrinking.
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。
This is Myotis tricolor, a relatively common savanna species that is widespread across Africa.
自从我们的祖先10万多年前第一次踏上非洲的热带稀树草原，我们已经走了很长一段历程。
We have come a long way since our ancestors first stood up on the African savannah more than a hundred thousand years ago.
在广袤无垠的稀树草原上，游客将有四天的时间观看收割现场，与农夫们共进午餐。
In the expansive savannas there, visitors spend four days watching the harvest, eating lunchwith farmers.
如果你是稀树草原上的早期人类，最好是害怕一切种类的蛇而不是仔细检查每种蛇的毒液。
If you're an early human on the savanna, you're better off fearing all snakes than having to closely examine each specimen for venom glands.
科学家们使用了详细的基因分析证明，非洲的稀树草原象和非洲森林象已被不同的物种几百万年。
The scientists used detailed genetic analysis to prove that the African savanna elephant and the African forest elephant have been distinct species for several million years.
人们通常认为岛屿非常小，所以不可能有稀树草原，不过我们特立尼达岛有稀树草原，还有红树林。
People usually think that an island is too smallto have savannah 'cause…we have savannah in Trinidad, mangrove forests also.
然后作者又提出求异质性在时间上的指数，这多半采用以下方法：生境：森林为—1，草甸或稀树草原为O。
The author then proposes to develop an index of heterogeneity in time, perhaps in the following manner: Habitat, applying the numbers-1 of forest, o for meadow or savanna.
但是，最近史密森学会却公布了20万张野生动物影像，这些影像是用隐藏在全球各地森林、丛山和热带稀树草原的自动相机拍摄到的。
But the Smithsonian Institution recently released more than 200,000 wildlife images captured by automated cameras hidden in forests, mountains and savannas across the globe.
但是，最近史密森学会却公布了20万张野生动物影像，这些影像是用隐藏在全球各地森林、丛山和热带稀树草原的自动相机拍摄到的。
But the Smithsonian Institution recently released more than 200, 000 wildlife images captured by automated cameras hidden in forests, mountains and savannas across the globe.
此地“蕴藏着拉美最纯粹的自然之美，有茂密的热带雨林，无垠的热带稀树草原，水生生物繁盛的珊瑚群，还有养在深闺无人知的纯美沙滩。”
The area is "home to some of the purest natural beauty in Latin America , with dense tropical rain forests, wide savannas, coral reefs bursting with aquatic life, and delightfully deserted beaches."
实验表明，如果美洲稀树大草原没有发生火灾，物种组成将发生显著变化。
Experiments suggest that if fire did not occur in savannas in the Americas, species composition would change significantly.
实验表明，如果美洲稀树大草原没有发生火灾，物种组成将发生显著变化。
Experiments suggest that if fire did not occur in savannas in the Americas, species composition would change significantly.
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