Because the air is substantially thinner at high altitudes there is substantially less oxygen.

因为在高海拔地区，空要稀薄得多，所以氧含量很少。

Everest has the highest altitude on the planet.

珠峰则地球上海拔最高的山峰。

After it leaves China and the high altitude, the Mekong becomes wide, brown and warm.

当出中国，出高地后，湄公河就变宽，变暖了。

They get up into high altitude air currents.

它们可以进入高空行。

Which of these cloud types is typically found at the highest altitude?

些云类型中哪个通常在最高海拔处被发现的？

These spacesuits are crucial for those who are heading for super high altitudes.

些宇航服对于那些正前往超高海拔地区的人们来说至关重要。

One of the only kind of animals living in this high altitude.

地唯一一种生活在种高海拔地区的动物。

And tour companies would need at least three years experience organizing high altitude expeditions.

旅游公司需要至少有三年组织高峰探险的经验。

It's high altitude so the temperatures are quite cool in the day.

那里海拔很高，白天的温非常凉爽。

This made them likely to crash under the enormous stress of high altitudes.

使得它们很可能在高空的巨大压力下会破裂。

People in the Ethiopian highlands have adapted to living at high altitudes.

埃塞俄比亚高地的人们已经适应了高海拔地区的生活。

People do get high altitude pulmonary edema and high altitude cerebral edema here as well.

里也会发生高原肺水肿和高原脑水肿。

This is that harness that I wear at high altitude.

我在高海拔时戴的安全带。

At this high altitude you can clearly see storm churn white caps in the ocean.

在么高的海拔上，你仍然可以清楚地看到在海洋风暴中被搅动起来的白色帽子。

Polaris Dawn will reach its highest altitude on its first day.

“北极星黎明号”将在第一天达到最高高度。

Experts say La Nina tends to reduce high altitude winds that weaken hurricanes.

专家表示，拉尼娜现象往往会减少高空风，从而削弱飓风。

Higher altitude combined with the bulge creates the weakest gravity anywhere on the planet.

高度和纬度造就了地球上重力最弱的地区。

The climbers reached out to Storz because he studies how animals adapt to high altitudes.

登山者联系了斯托兹，因为他研究动物如何适应高海拔。

Such high altitude shoot-downs are meant to safely destroy incoming nuclear, biological and chemical missiles.

它能够在大层外拦截导弹，特别核生化导弹。

This is why it's so much harder to breathe at higher altitudes.

就为什么在高海拔地区呼吸要困难得多。