一阵阵微风，时不时的刮过这片空地，与其说是一股气流，不如说是凉意在流动；就这样，就算是在我的巨大房间里，空气也整夜都是新鲜的。
A faint wind, more like a moving coolness than a stream of air, passed down the glade from time to time; so that even in my great chamber the air was being renewed all night long.
尽管温度不需要气流，但它还是保持流动获得新鲜空气。
Even when no air flow is needed for temperature purposes it is kept moving to keep the air fresh.
火龙卷风是由一个正在燃烧的核心和看不见的一片旋转气流组成的，旋转气流不断把新鲜空气注入核心。
A fire tornado consists of a core-the part that is actually on fire-and an invisible pocket of rotating air that feeds fresh oxygen to the core.
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