一蹦四级台阶地下楼梯 come down the stairs four at a time
武汉市岩溶地面塌陷发生在具二元结构的北东向长江一级阶地与近东西向褶皱构造向斜核部碳酸岩盐地层相交的部位。
The karst surface collapse in Wuhan happened at the intersection between the ne first terrace binary-structured deposits of Yangtze River and carbonate in the core of E-W syncline.
在山麓地带，阶地与麓原面联合成一级地貌面，二者在空间上连续、在高度上可比。
In the piedmont zone the terrace and pediment surface jointly formed a geomorphic surface; they were contiguous in space with comparable elevation.
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