Because it is extremely cold at very high altitudes, snow rarely melts.
因为海拔很高，天气非常寒冷，雪很少融化。
People in Ethiopian highlands have adapted to living at high altitudes.
埃塞俄比亚高地的人们已经适应了在高海拔地区生活。
In the troposphere, the air at higher altitudes is in general cooler than the air below it.
在对流层中，高海拔地区的空气通常比低海拔地区的空气冷。
For starters, cabin pressures at high altitudes are set at roughly what they would be if you lived at 5,000 to 8,000 feet above sea level.
对于初学者来说，高海拔地区的舱内压力大致被设定为住在海拔在5000到8000英尺高的地方会有的压力。
Wind velocity also increases with altitude and may cause serious stress for trees, as is made evident by the deformed shapes at high altitudes.
风速也随着海拔高度的增加而增加，可能给树木带来严重的压力，这从高海拔地区的变形就可以看出来。
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。
Snow leopards live at high altitudes.
雪豹生活在海拔高的地区。
Above 5,490m is the realm of the heavy jets, since jet engines operate more efficiently at higher altitudes.
超过5490米是重型喷气式飞机的领域，因为喷气式发动机在更高的高度运行时效率更高。
Astronomers therefore prefer dry sites with little water vapor, which is generally found at higher altitudes.
因此，天文学家更喜欢水蒸气很少的干燥地点，而水蒸气通常出现在海拔较高处。
In this process, sedimentary rocks that originally formed on the seabed may be folded upwards to altitudes of more than 26,000 feet.
在这个过程中，最初形成于海床上的沉积岩可能会向上折叠到26000英尺以上的高度。
Our 9, 500 glaciers are located at very high altitudes.
我们的9500块冰川位于海拔非常高的地方。
The hot towers allow water vapor to reach unusually high altitudes.
这些热塔使水汽上升到非同寻常的高度。
For now, hikers in the Himalayas are advised not to drink melted snow at altitudes.
现在开始，喜马拉雅山的登山者被告知不要饮用高海拔地区的雪水。
In the stratosphere, the air gets warmer at higher altitudes, which provides stability.
平流层的气体随着海拔升高而变暖，这使得气流稳定。
On the left, the purple, cyanand green hues signify low, medium, and high altitudes, respectively.
左图中的紫色、蓝绿色和绿色分别表示低、中和高海拔。
At high altitude you have jet streams, and the wind velocity is not the same at all altitudes.
在高海拔处会有高速气流，风速在不同的海拔处，并不相同。
A contrail is the visible vapor trail behind airplanes or rockets traveling at high altitudes.
这团痕迹可能是飞机或火箭飞上高空后留下的航迹云。
The antineutrons escape the atmosphere and then decay into antiprotons at much higher altitudes.
反中子逃离大气，然后在高得多的区域衰变为反质子。
In addition, villagers who lived at higher altitudes spoke of unusually hot summers and early springs.
此外，居住在高海拔地区的村民提到了酷暑和早春的异常气候现象。而居住在低海拔的村民则抱怨起蚊子来。
Most problems have been respiratory, which is attributed to the high altitudes and the dusty environment.
其中大部分是由于当地的高海拔和尘土环境导致的呼吸系统疾病。
High altitudes, cold sea water and pollen can prevent certain groups of people to visiting these areas.
高纬度，冰冷的海水和花粉可能去阻止一些人去这些地方。
Overpressures of 1 to 2 pounds are produced by supersonic aircraft flying at normal operating altitudes.
一到二磅的超压是由正常飞行高度的超音速飞机制造的。
But plane soot occurs at low enough altitudes for rain to wash it out of the atmosphere in just days or weeks.
但是飞机烟尘是在低纬度，雨水在几天或几星期就把它们从空中冲洗干净了。
These have been getting brighter and more common in recent years, and also seem to be moving to lower altitudes.
这些云层在近年中变得颇为明亮，出现得也更加频繁，并且这些云层似乎也正向着低处移动。
Rockets expel the stuff at altitudes three times as high - in the stratosphere more than 40 kilometres above sea level.
而火箭排出物三倍高于飞机- - -在海拔40多千米的平流层。
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。
And there are other factors: UV is strongest in the summertime, at midday, at higher altitudes, and close to the equator.
当然还有其他原因：在夏天、正午、高海拔和靠近赤道的地方，紫外线特别强烈。
It's as easy to get sunburned in winter as in summer - even more so if you're exercising in the snow or at high altitudes.
冬天其实和夏天一样，很容易被晒伤——如果你在雪地或者高海拔地区的话会更严重。
It's as easy to get sunburned in winter as in summer - even more so if you're exercising in the snow or at high altitudes.
冬天其实和夏天一样，很容易被晒伤——如果你在雪地或者高海拔地区的话会更严重。
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