So much of the "money" out there today is basically made up out of thin air.

所以，今天大部分在市场里的“钱”基本上是凭空创造出来的。

youdao

Roughly 100 miles (160 kilometers) above Earth, the air is so thin that satellites can zip through with little resistance.

在离地大约100英里(160公里)的地方，空气已经变得十分稀薄，允许人造卫星在低阻力下高速飞行。

youdao

So not only do these look great on your desktop levitating in thin air, they are also technology marvels!

那么不仅这些看起来伟大在您的浮动在稀薄的空气的桌面上，他们也是技术奇迹！

youdao

At about nineteen-thousand meters, the air is so thin and the amount of oxygen so small that a person needs a lot of special equipment to survive.

VOA: special.2011.04.06

It will also be tricky to find builders who can work well at such altitudes (few people can do hard manual labour where the air is so thin).

ECONOMIST: Beneath the Southern Cross I stand

The air is so thin that the first glimmer of sun can throw it into violent convection, lofting up into towering thermals, twisting into dust devils, and collapsing back down as they cool.

NEWYORKER: The Martian Chroniclers

The experience was made even more spectacular by the appearance of a second, larger and more inquisitive bear that was so well camouflaged he appeared almost out of thin air.

BBC: Life in the fragile, frozen Arctic