稀薄

máng máng bái wù jiàn jiàn xī bó le

茫茫白雾渐渐稀薄了。

The seemingly endless fog is gradually thinning.

gāo hǎi bá qū yù kōng qì xī bó

高海拔区域空气稀薄。

The air is rare at high altitudes.

tā bù néng xiāo shī zài xī bó de kōng qì zhōng

她不能消失在稀薄的空气中。

She can’t just have vanished into thin air.