In human memory, there are many clips, they like dancing leaves in late autumn, the wind flowing more like the wizard.
在人的记忆里有许多片断,它们如晚秋中翩翩起舞的红叶,更象随风飘逸的精灵。
Wind movements are also modified in cities because buildings increase the friction on air flowing around them.
风向在城市里也会改变,因为建筑物增加了它们周围流动的空气的摩擦力。
You can do other things too, like look at the wind or water that brought the grains to their location and figure out which way it was flowing.
你也可以做其他事,比如观察把沙粒带到它们位置上的风和水,并找出它们的流向。
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