夯土基础
Rammed earth foundation
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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.
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