In addition, portions of the wall in Gansu were made of packed earth, which is less resilient than the brick and stone used elsewhere in much of the wall's construction.
此外，甘肃部分长城段由夯土构成，不如其他地区由砖石构建的长城段那样坚韧。
2
Made of rammed earth and rubble, these fortifications became the basis for the Great Wall, most of which would be rebuilt in stone and brick during the 15th century A.D. under the Ming dynasty.
这些由夯土和瓦砾修筑的堡垒成了长城的基础。长城中的大部分用砖石砌成，在十五世纪的时候由明朝修建。
3
The outside walls of the earth buildings are constructed of brick and mud packed together with tools called tamps.