二级阶地 meaning in Chinese

second terrace

Through the field research of landform and cultural sites in guanting basin of the upper reaches of the yellow river in qinghai province , the authors analyzed the structure of the second terrace of guanting basin and concluded that the second terrace came into being in middle holocene
摘要通过对黄河上游官亭盆地地貌及古文化遗址的野外考察，分析了盆地中黄河二级阶地的结构，认为该阶地形成于全新世中期。
At the end of late pleitocene , influenced by the climate of glacier period , the last great event of the region in the geological time was taken place so that the migration and extinction of organism species were resulted , loess accumulation was generally developed throughout the whole region , in the holocene , the most important environmental change was fluvial process , which was still influnced by two factors - neotectonics and palaeoclimatic changes
更新世晚期末，受末次冰期气侯的影响，本区发生了地史时期的最后一次大事件，造成了物种迁移和绝灭，全区广泛发育黄土堆积。进入全新世，本区环境变化以河流作用最为显著，沉积物主要分布在各大水系的河谷中，构成一、二级阶地和近代河床与河漫滩堆积。