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

因为在高海拔地区，空气要稀薄得多，所以氧气含量很少。

Thin and runny magma means gas trying to escape can do so easily.

岩浆稀薄意味着气体容易逸出来。

The air is thin. The temperature changes in spring and fall are extreme.

这里空气稀薄，春季和秋季的气温变化又极端。

The thin mountain air made some of the climbers feel dizzy.

山上稀薄的空气使一些登山者头晕起来。

One that has a thin atmosphere, and that has water oceans.

这颗行星上大气稀薄，有海水。

Indeed, phosphine seems to be safely and enthusiastically produced in all of these oxygen-poor ecosystems.

确实，看似磷化氢在这些氧气稀薄的生态环境中安稳且肆无忌惮地被制造出来。

The air seemed thin, as though its combination of gases had little oxygen left.

空气似乎很稀薄，好像在混合的气体中剩下的氧气很少。

But as altitude increases, the air starts to get thinner.

但当海拔升高，空气也随之变得稀薄。

I guess you'd say they sort of pulled it out of thin air.

我想你会说他们是从稀薄的空气中抽出来的。

Does the air seem a bit thin to you up here?

我觉得这里的空气好稀薄？

That's because the air is thinner the higher you go.

这是因为所处高度越高，空气越稀薄。

The other is that the rarefied nature of astrochemistry changes the way processes work.

二是天体化学其稀薄的属性会改变化学反应的过程。

Mars has a thinner atmosphere than earth which complicates setting down safely on the surface.

火星的大气层比地球稀薄，这使得在火星表面安全降落变得困难。

Due to the fact that they don't burn up in my thin atmosphere.

我稀薄的大气无法将它们燃烧。

Aviation fuel is a very thin, non-viscous, type of fuel.

航空燃料是一种非常稀薄、非粘性的燃料。

Although thinner than crude oil, jet fuel is still very dangerous for wildlife.

虽然比原油稀薄，但航空燃油对野生动物来说仍然非常危险。

Left behind in a forest, wood chips and thinned-out logs can still burn.

留在森林里的木屑和稀薄的原木仍然会燃烧。

With its thin atmosphere, solar heat on the Martian surface easily escapes into space.

由于火星大气层稀薄，火星表面的太阳热量很容易逃逸到太空中。

His thin, colorless hair was unkempt and there was a large bald patch on top.

他那稀薄的淡色头发蓬乱不堪，头顶上还秃了一大块。

The thin translucent smoke he sees rising from the ruins is in fact highly radioactive.

他当时见到的废墟升起的稀薄透明烟雾 其实具有高度放射性。