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.

"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。

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The quality of high altitude sampes are better than low altitudes.

低海拔地区大黄的质量不及高海拔地区；

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Bailey agrees Lippl's findings are interesting but laments the study's lack of a control group staying at low altitudes.

贝利也认为利普的发现很有趣，但遗憾的是实验没有在低海拔地区设置对照组。

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At low altitudes they help to cool the Earth by reflecting sunlight away from it.

ECONOMIST: Climatology: Grey-sky thinking | The

The scenery belies the relatively low altitudes, with great alpine hiking at just 2, 000m above sea level.

BBC: Spain��s mountains made of cheese

They are most effective when fired at aircraft flying at low altitudes, as at take-off or landing.

ECONOMIST: The shoulder-held threat | The