Bricks are one of the oldest known building materials, dating back thousands of years.

砖是已知最古老的建筑材料之一，可以追溯到几千年前。

The genetic material dates back at least two million years - that's nearly twice as old as the mammoth DNA in Siberia that held the previous record.

这种遗传物质至少可以追溯到200万年前——比此前纪录保持者西伯利亚猛犸象DNA要古老两倍。