An electric battery was discovered in a rock carbon dated approximately 500,000 years ago.

在岩石中发现了碳测定是大约500,000年以前的一块电池。

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Food grains, scraps of cloth, bits of wood and so on can thus be dated by finding out how much radioactive carbon is left in them: the less there is, the older they are.

粮食、衣服碎片、木片等等都可以通过计算它们含有多少放射性的碳元素来判断它们的年代。含的越少，年代就越悠久。

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Scientists have now accurately carbon-dated the sharp tip that itself carved from mastodon bone.

如今，利用放射性碳素测定年代法，科学家已确定这一用乳齿象牙雕刻而成的长矛尖端的精确年代。

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"They will be taken to a lab in Edinburgh, and radio-carbon dated, " she added.

BBC: Human remains found in Bronze Age pots

Soil samples from around the stone's socket will be analysed and any organic material found radio-carbon dated if possible.

BBC: Human remains found in Bronze Age pots

Remains in a blacksmith's hearth have been carbon-dated to about 1, 000 years ago.

ECONOMIST: Helge Ingstad