参加一个小型的团体自行车之旅，探索华盛顿特区的核心地带。
Join a small group bike tour for an evening of exploration in the heart of Washington DC.
跟着铁路线穿过保安区就进入了核心地带。
We can follow the railway lines through the security perimeters and into the elite compounds.
这种核心地带与边缘地带的区别，在很多国家都存在。
This division of core and periphery is common in many countries.
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