可能最明显的人类对这个星球的影响是城市的建设，这种建设需要人类生产制造的材料如钢铁，玻璃，混凝土，砖头等等修造的巨大的结构框架。
Probably the most obvious way humans are altering the planet is by building cities, which are essentially vast stretches of man-made materials-steel, glass, concrete, and brick.
岩石桥梁链子被修造运载增长的交通路线66在St城市附近。
The Chain of Rocks Bridge was built to carry the growing traffic of Route 66 around the city of St.
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