Archaeologists have found evidence of ancient stone tools used by monkeys in Brazil.

考古学家在巴西发现猴子使用石器证据。

Stone tools suggest that most of our ancestors were, like most of us, right-handed.

石器表明，我们的大多数祖先和我们大多数人一样，也是右撇子。

Of 14 stone tools found at one site, 79 percent still carried traces of maize.

在出自同一处遗址的14个石具中，79%的石具上残留有玉米的痕迹。

Stringer and his co-writers say they studied fossils and stone tools found in Europe.

斯特林格和他的合著者说，他们对发现于欧洲的化石和石器进行了研究。

This belief has changed because of a collection of 2.4-million-year-old stone tools found in Algeria.

而这一信念发生了变化，因为在阿尔及利亚发现了一批240万年之久的石器。

The surface was finished with the same kinds of stone tools used to make the original.

人们用原版矛所用的同类石器给复制品的外层进行了抛光。

In other words, people used fire, engaged in hunting and gathering and made simple stone tools.

换句话说，人们使用火，从事狩猎和采集，制作简单的石制工具。

Also, in terms of ancient stone tools, they're gonna use things like obsidian, it's volcanic glass.

此外，就古代石器而言，他们会使用黑曜石，这是火山玻璃。

Scientists working in northern Kenya have unearthed the oldest stone tools ever found. More details from Rebecca Morelle.

在肯尼亚北部做研究的科学家们发掘出至今为止发现的最古老石制工具，丽贝卡·莫雷勒报道。

Recently, scientists have looked at what happens inside the brain when a stone tool is being made.

近来科学家研究了制造工具的过程人类大脑中的活动情况。

So, to figure this out, scientists look at migration patterns, stone tools, carved shells, cave art, and other artifacts.

因此，为了弄清这一点，科学家们研究了迁徙模式、石器、雕刻贝壳、洞穴艺术和人造制品。

Such findings were based on different kinds of evidence — including stone tools, fossil bones and genetic studies.

该研究结果有多种证据为依据——包括石器、化石骨骼和基因研究。

Those hands were shaping stone tools; tools that represent the first step on the great journey of shaping our world.

那双手在塑造石质工具，它们象征着人类改造世界伟大征程的第一步。

Stone tools that hunter-gatherers used also were found.

还发现了狩猎采集者使用的石器。

Some of these bones showed stone tool marks.

其中一些骨头显示出石器工具的痕迹。

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。

The scientists think the migrants brought along advanced stone tools called microliths.

科学家们认为移民带来了称为微石器的先进石器。

So the people that lived there had only stone tools, no metals.

所以住在那里的人只有石器，没有金属。

And that's a sign that there were markets for stone tools.

这表明石器有市场。

These simple stone tools allowed us to rip through meat and would become the tool of choice for 2 million years.

这些简单的石器使我们能够撕开肉，并成为200万年来人们选择的工具。