Science has told you that at such an altitude the air is rarefied.
It appears to respire as easily in the most rarefied air as on the seashore.
But I will not press this view, which may be too rarefied and lofty for the vulgar mind.
The birds had long abandoned us, for in that rarefied air they could not have flown.
They were intoxicated with rarefied atmosphere, not with ...