Instead of desert sand, hard, gray, concrete covered the land.

只不过覆盖着土地的不是沙漠里的沙子，而是坚硬的灰色混凝土。

After the accident, a giant steel and concrete cover was built to seal reactor four and contain some of its radioactive material.

事故发生后，建造了一个巨大的钢筋混凝土盖板来密封四号反应堆并容纳其中的一些放射性物质。