“阶地”的拼音？

坑穴四壁是成阶地的.The walls of the craters are terraced.海岸顶上是后滨阶地.At the top of the shore is a berm.村镇居民多住二级阶地.Residents live in and towns in the secondary stage....

“阶地”的英语可以翻译为：[地质] terrace，catstep，bench，berm ...