坑穴四壁是成阶地的。
越冲越深，冲到石头底部的一半时，石头必定倒在坑穴里。
The more blunt, rushed to the rock at the bottom of the half, stone will surely fall in the foxholes.
许多科学家相信，月球坑穴是流星和彗星碰撞月球所造成的。
Many scientists believe that Lunar craters were formed by the collision of meteors and comets against the moon.
应用推荐