这一发现对于研究北京平原地区人类活动的历史和自然环境的演变，具有重要的科学价值。
This discovery has a important significance for studying the relationship between human active history and paleoenvironment evolution on Beijing Plain.
这一发现对于研究北京平原地区人类活动的历史和自然环境的演变，具有重要的科学价值。
This discovery has a important significance for studying the relationship between human active history and paleoenviro…
本文论述了长江中游平原的资源特点，分析了自然环境的演变过程，并探讨了开发利用中存在的问题及其合理利用的途径。
In this paper, the characteristics of natural resource of the Middle Reach Plain of Changjiang River is introduced and the evolution of its natural environment is also analysed.
无机矿物质按照砂岩和泥岩的顺序沉积着，并随着周围的自然环境演变为海洋性，由石灰石覆盖在了最上层。
Organic materials were deposited in sequences of sandstone and mudstone, which were then covered by limestones as the environment became progressively more Marine.
第四纪自然环境的形成和演变是第四纪地质史研究的中心环节。
The formation and evolution of Quaternary natural environment is the key link of Quaternary geological study.
三角洲顶点城市是基于城市区位和三角洲自然环境演变特征而提出的经济地理概念，此类城市的存在具有一定的广泛性。
The conception of the apex city of delta belongs to the field of economic geography, which is put forward based on the city location and the natural environment evolution of delta.
三角洲顶点城市是基于城市区位和三角洲自然环境演变特征而提出的经济地理概念，此类城市的存在具有一定的广泛性。
The conception of the apex city of delta belongs to the field of economic geography, which is put forward based on the city location and the natural environment evolution of delta.
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