21世纪以来，北京的三环路、四环路周边也形成了新的办公业集聚现象。
Since the 21st century, Third Ring Road and Fourth Ring Road in Beijing has developed a new around office industry center.
21世纪以来，北京的三环路、四环路周边也形成了新的办公业集聚现象。
Since the 21st century, Third Ring Road and Fourth Ring Road in Beijing has developed a new around office industry center.
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