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.
现在世界上这么多人口，星期天到处都拥挤不堪。
There are so many people in the world now. It is crowded everywhere on Sundays.
旅游业使得世界上的某些地方变得拥挤不堪，无法居住。
Tourism makes some parts of the world too crowded a place to live in.
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