These reports are based on samples collected four years apart, 2002 versus 2006, respectively.
这两份报道分明是以相隔4年 在2002年和2006年收集到得样本为依据。
Apart from the main gate, Qiyun building has a subordinate gate on its east and west side respectively, which is rare among the earth buildings.
齐云楼除大门外，东西两侧各有一小门，这在土楼里极为少见。
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