移动沙丘

Some of the dunes are small and fast-moving.

对有些小沙丘和快速移动。

Conditions for maintenance of reticulate dune morphology under modern flow environment include enough space for the development of secondary ridges on the primary ridges in order that the overall pattern can not be modified by the subdominant winds, and sufficient amount of sand supply for the secondary ridges that can withstand the dominant winds.

在背风坡，因原始气流方向、强度和沙丘背风坡形态等的不同出现弱的反向气流，相对强的附体未偏向流和附体偏向流等三种特征次生气流，它们控制着背风坡表面过程、沙丘移动性质、内部层理类型和产状。

The dunes continue to form and move under the influence of water and wind.

沙丘不断形成和移动下的水和风力的影响。

A major reason is that the dunes bury any plants in their way as they move across the desert.

一个主要的原因是，埋在沙丘的路上遇到的任何植物，沙漠移动。

Approximately 30,000 years ago, long on stable sand dune plant root, passes through the long time the decency, has formed the limestone, after the plant dies, the sand dune unceasing migration, causes these calcifications the limestone to reveal the surface, has formed the stalagmite which the present sees.

大约在3万年前，长在稳定的沙丘上的植物根部，经过长时间的风化，形成了石灰岩，植物死后，沙丘的不断移动，使这些钙化的石灰岩露出地表，形成了现在所看到的石笋。

Barchans are mobile, crescent-shaped dunes that move in the direction of the prevailing wind at rates as high as 33 feet (10 m) per year, sometimes even covering infrastructures such as this road in the Nile Valley.

Barchans是移动，新月形沙丘是朝着在高达33英尺（10米）每年，有时甚至包括象这样在尼罗河谷公路基础设施利率主导风向。

The moving direction of dune is WNW→ESE, with speed of 7-81meter per year.

沙丘移动方向是WNW→ESE，移动速度大体在7-81米/年。

Within the lower part of the Rift lies the Olduvai Gorge where, according to the paleontologist LSB Leakey, the earliest forms of man originated.

在松吉地区有马腾戈山地。沿海低地带两头小中间大，宽15至65公里，沿岸有许多珊瑚礁和移动沙丘。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。