Condensation occurs when cold air meets warm air.

冷空气遇到热空气时会产生冷凝。

Clouds form when warm air rises and cools.

当暖空气上升并冷却时，云形成。

Gravity pulls down cold air, and warm air rises.

重力把冷空气拉下来，暖空气上升。

When we touched down to blue skies and warm air, I sent up a small prayer of gratefulness.

当我们降落到蓝天和温暖的空气中时，我发出了一个小小的感恩祈祷。

Warm air rises by convection.

暖空气因对流作用而上升.

Though the air-conditioner gave off warm air, he felt cold.

虽然空调释放着热空气，他仍然然感觉寒冷。

With the cycling warm air drying system.

具有热风循环的烘干系统.

As the warm air gose uo , It cools down.

暖空气走了, 就会降温.

Large birds of prey soar on drafts of warm air.

大型捕食鸟儿在暖气流上飞翔.

Warm air, soft and kind, blew through the trees.

温暖的微风会轻柔而又慈爱地在林间披拂。