从轮藻角度讲，中国当阳跑马岗组的白垩-古近系过渡段的生物地层记录是世界上迄今所知的最连续和最丰富的。
From the point of view of charophytes, the biostratigraphic records from the Paomagang Formation in Dangyang (China) are most continuous and abundant known so far in the world.
警卫每隔一段时间换一次岗。
滹沱河岗黄段湿地是北方干旱缺水地区典型的河湖湿地，其影响因子可分为自然因子与人为因子。
The wetland in Ganghuang section of Hutuo River is a typical wetland of arid area in north China. The affecting factors can be divided into natural factor and human factor.
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