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。
Snow leopards live at high altitudes.
雪豹生活在海拔高的地区。
The air is rare at high altitudes.
雪在那个国家是罕见的。
It is difficult to breathe at these altitudes.
在这些高的地方很难呼吸。
At high altitudes, it is difficult to breathe.
在高纬度的地方呼吸很困难。
It is difficult to breathe at these altitudes.
在这些高的地方呼吸感到困难。
I worry about what happens when I get into high altitudes.
我担心进入高原后会发生什么问题。
The space shuttle can orbit at altitudes of up to 965 kilometers.
这架航天飞机最高能在965公里的高度作轨道运行。
Now, fresh research points to a possible explanation: high altitudes.
现在，最新研究指出了一个可能的解释：高海拔。
The end result is a significant increase in performance at higher altitudes!
最终的结果是显着增加，表现在更高的高度！
At higher altitudes air pressure is lower, even though the plane is pressurized.
在较高海拔区域气压较低，尽管飞机已经在加压了。
Mountain climbers often carry oxygen tanks because the air is very thin at high altitudes.
登山者通常会携带氧气筒，因为在极高的地带空气相当稀薄。
Mountain climbers often carry oxygen tanks because the air is very thin at high altitudes.
登山者通常会携带氧气筒，因为在极高的地带空气相当稀薄。
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