rarefied

稀薄的

Climbers struggle to breathe in the rarefied air near the summit.

登山者在接近山顶的稀薄空气中呼吸困难。

高深的、艰深的、深奥的

The lecture moved into rarefied theory that few students followed.

这场演讲进入了艰深的理论，没几个学生跟得上。

上流的、小众的、不食人间烟火的常带贬义

She grew up in the rarefied world of competitive figure skating.

她成长于花式滑冰竞赛那个小众又封闭的世界。

使稀薄、稀释rarefy 的过去式与过去分词

The gas was rarefied until the pressure dropped sharply.

这种气体被抽得稀薄，直到压力急遽下降。