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。
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。
Beneath that Hellenistic layer he found buildings scattered with four olive pits, which carbon-14 analysis dated to around 1000 B.C..
在希腊地层(Hellenistic layer)之下的建筑中，加芬克尔找到了四个橄榄核，经碳- 14分析确定其年代为公元前1000年左右。
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