?微斜阶地
... 渐进性大发生；梯坡层级 gradation 微斜阶地 graded terrace 梯度 gradient ...
斜沟式阶田
Just as we reached the far side, I noticed that the gradual terrace that normally allowed easy access to the road was now steeper and recently graded.
NPR: Amputee Wounded in Iraq to Return to Active Duty
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。