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。
And because those artifacts closely resemble others from nearby sites previously carbon-dated to about 9000 B.C., Schmidt and co-workers estimate that Gobekli Tepe's stone structures are the same age.
因为这些人工制品和附近经过碳定年确定为公元前9000年左右的遗迹里找到的制品是如此相似，斯密特和他的伙伴们估计歌贝克力山顶遗址和这个遗迹是出自同一个时期的。
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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