Through the long-term monitoring of deformation of the deep soil and surface soil, a great number of primitive data were obtained.

通过对油罐地基地表土与深层土变形的长期观测，取得了大量的原始数据；

youdao

The loss of the springs brought with it a loss of the natural filtration of soil and sand, however, so the Maya built their own primitive filtration systems, forcing their rainwater runoff through boxes of sand, the researchers found.

MSN: Sustainable tech saw the ancient Maya through drought