The new method placed the age of the sediment layer containing the stone tools at around 1.4 million years.

新方法确定了含有石器的沉积层的年龄约为140万年。

But the Stone Age men who traded those stone tools and weapons had to make markets somehow.

但石器时代的人们交易这些石器和武器必须以某种方式创造市场。

In those first digs, archeologists had found some stone tools and pieces of natural pigment called ochre that they thought were 50 to 60,000 years old, which suggested that humans might have shown up in Australia around then.

在最初的挖掘中，考古学家发现了一些石器和称为赭石的天然色素碎片， 他们认为这些东西有 50 到 6 万年的历史， 这表明人类可能大约在那个时候出现在澳大利亚。