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陵墓周围的巨大墙体延伸了将近六公里，装有四扇大门，配有堡垒、炮台和其他特色建筑，整个防御工事一直保留到了今天。
The massive walls, extending for nearly 6 km, still survive; they are pierced by four gates and equipped with bastions, artillery towers and other features.
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