我们从那里向左拐, 开始攀登通向台地的斜坡.Thence, bending to our left, we began to ascend the slope towards the plateau.野外观察表明托克托台地的湖相层与上覆的黄土之间存在风化剥蚀面.A weathering - denuding surface separates the lacustrine strata and layer of the loess in...