撞击坑

In the fluvial deposit environment, the quartz superficial characteristic is primarily by the inferior circle, the conchoidal breakage fracture and the submarine hit pit, revealing the transformation of current to the quartz; In lake-deposit environment, quartz sand superficial characteristic is by primarily abraded edges and parallel cleavage, the quartz maintained the primitive characteristic, indicating the quartz received few transformation of fluent, different quartz grain has their different curve character.

在河流沉积环境，石英砂的表面特征以次圆、贝壳状断口和水下撞击坑为主，显示了水流对石英砂颗粒表面的改造；在湖泊沉积环境中，石英砂的表面特征以多棱角和平行解理面为主，石英砂颗粒保持了原始的特征，表明了石英砂颗粒受到水流的改造比较少。不同沉积环境中石英砂颗粒表面结构特征都具有自己的曲线特征。

The pattern of cratering since then and the bright albedo of the leading side suggests that Dione has remained in its current orientation for several billion years.

今天遗留下来的撞击坑和比较亮的正面说明它现在的正面已经有数十亿年是正面了。

A small impact crater, pitted knobs, and a criss-cross mesh of dust devil trails across the martian surface.

一个小撞击坑，进站旋钮，和纵横交错的沙尘暴在火星表面的小径交叉网。

On September 30, 2009, LRO took this photo of a spectacular field of ejecta from a fresh impact crater south of Mare Tranquillitatis.

9月30日，2009年，劳资关系条例了一个新的撞击坑南部静海这壮观的喷射物领域的照片。

Hellas Planitia: an impact crater in the southern hemisphere over 6 km deep and 2000 km in diameter.

海拉斯平原：一个撞击坑在南半球超过6公里深和2000公里的直径。

With a diameter of about 1,400 miles and a depth reaching the lowest elevations on Mars, Hellas is one of the largest impact craters in the solar system.

拥有约1400英里的深度和深远的火星海拔最低的直径，赫拉斯是太阳系中最大的撞击坑之一。

Witha diameter of about 1,400 miles and a depth reaching the lowestelevations on Mars, Hellas is one of the largest impact craters in thesolar system.

拥有约1400英里的深度和深远的火星海拔最低的直径，赫拉斯是太阳系中最大的撞击坑之一。

With a four-kilometer drop, this high cliff surrounding Echus Chasma, near an impressive impact crater, was carved by either water or lava.

陡峭的悬崖围绕着Echus深谷，落差有4，000公里，而深谷就位于撞击坑附近，由流水或熔岩侵蚀而成。

With the progress of the theory and methodology of Cosmogenic surface exposure dating, the technique has been widely used in studies of Quaternary glaciations, impact craters, volcanic surfaces, and fault faces.

宇宙成因核素地表暴露测年技术的理论和方法日臻完善，目前它已被广泛到第四纪冰川、撞击坑、火山地貌、断层面等地学问题中来。

Some of the plains are heavily cratered while others are not.

不过也有有很多撞击坑的平原。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。