bench h terrace阶地段丘
bench-terrace丘陵台地
bench type terrace field水平型梯田
bench terrace risers梯埂
loess bench terrace黄土台地
bench terrace farming水平梯田耕作
Soft-ridged bench terrace软埂梯田
flood-plain bench flood plain terrace河漫滩阶地