The exploded city occupied most of the old city zone.
暴发的城市使未改造的老城区所剩不多了。
You can see old western buildings and houses everywhere in the old city zone.
你能在老城区的任何地方看到旧时的西式建筑和民居。
Guangzhou metro line 6 passes through the old city zone, so there are many control factors for tunnel ventilation design.
广州地铁6号线穿越老城区，因此隧道通风设计的控制因素较多。
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