We've seen maps of photographic activity around the world, and maps of traffic activity in a city, which reveal how heavily roads are used.
我们看过世界各地的摄影活动地图,看过道路拥挤不堪的城市交通活动地图。
We've seen maps of photographic activity around the world, and maps of traffic activity in a city, which reveal how heavily roads are used.
我们看过世界各地的摄影活动地图,看过道路拥挤不堪的城市交通活动地图。
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