突然他停下来，嗅了嗅空气中的味道。

Suddenly, he stopped and sniffed the air.

《柯林斯英汉双解大词典》

空气中弥漫着燃香的香气。

The air was sweet with incense.

《牛津词典》

空气中弥漫着橡胶燃烧的气味。

The smell of burning rubber filled the air.

《牛津词典》

That is metallic sodium that would keep in kerosene so it doesn't react with the oxygen in the air.

金属钠应该保存在没有中,这样它就不会和空气中的氧气反应了。

麻省理工公开课 - 固态化学导论课程节选

The main goal of the respiratory system is to bring fresh in so that you can extract oxygen from it, and blow used air out so that you can rid of carbon dioxide which is the end product of carbon metabolism inside our bodies.

呼吸系统的主要功能是,吸入新鲜空气,以便获得空气中的氧气,呼出废气,以便排出二氧化碳,二氧化碳是人体内碳代谢的终产物

耶鲁公开课 - 生物医学工程探索课程节选