The fields' circular shape... 管子围绕一个中心轴灌溉耕地

44. 25,000 years ago.
    渗入地下形成的
45. Fossil water also enables crops to be grown in the desert...
    原生水也能让庄稼在沙漠中生长
46. To provide food for local populations.
    为当地人提供粮食
47. The fields' circular shape...
    管子围绕一个中心轴灌溉耕地
48. Derives from the pipes that irrigate them around a central pivot.
    耕地就围绕这些管子形成圆形
49. But there is a heavy price to pay.
    但这要付出沉重代价
50. Fossil water is a nonrenewable resource.
    原生水是不可再生资源

来自《家园 第二部分 Home Part2》第 47 行