People today know that there are no underground cities on the moon.
现在的人们知道月球上没有地下城市。
The USA, China, and Russia have massive underground cities all over the world.
美国，中国，俄罗斯有巨大的地下世界各地城市。
Many important underground pipelines are made of metal materials in cities and factories.
在城市及工厂的地下管线中，许多重要的管线是用金属材料制成的。
Many cities have underground car parks.
很多城市都有地下停车场。
Many cities have underground shopping areas.
许多城市都有了地下商场。
Many cities have underground shopping areas.
许多城市都有了地下商场。
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