During spring, warm air moves north and mixes with cold air remaining from winter.

VOA: special.2009.06.09

I'm hot, compared to the air of the room, or cold if I'm somewhere that's warm.

我相对于室内的空气是热的，或是冷的如果我呆在一个温暖的地方。

麻省理工公开课 - 热力学与动力学课程节选

Warm air rising from below causes the wind tube to reach toward the ground.

VOA: special.2010.05.11

He could feel the warm, sweet air inside.

VOA: special.2009.04.04

But inside, the air was warm and sweet.

VOA: special.2009.04.11