Even if climbers escape severe mountain illnesses, the air is thin and cold. Breathing is hard.

即使攀登者能幸免于高山疾病的侵害，山上冰冷稀薄的空气也足以让人步履维艰，呼吸困难。

youdao

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。

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THE Indian rope trick is a legendary feat of magic in which a boy climbs a rope only to disappear into thin air at the top.

印度通天绳是一种奇幻的魔术技艺，参与表演的男孩爬上绳子，最终在顶端消失得无影无踪。

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

The first is the lack of oxygen in the extremely thin air.

VOA: special.2010.06.30

The best known is "Into Thin Air."

VOA: special.2010.06.30

Flying high in the earth's atmosphere, where the air is thin, is, he says, rather like flying near the surface of Mars.

ECONOMIST: Planetary pretenders

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

Rescue helicopters can't reach above Camp 2 because the air is too thin.

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