Radiocarbon dating of fossils taken from caves on islands along southeastern Alaska's coast suggest that at least a portion of the area was remaining ice-free during the last ice age.
从阿拉斯加东南海岸岛屿的洞穴中提取的化石的放射性碳年代测定法表明，在最后一个冰河时代，该地区至少有一部分保持无冰状态。
Radiocarbon dating showed that the head's age matched the king's date of death.
放射性碳显示这个头颅的年龄符合国王的死期。
The shroud was also damaged by a fire in the late Middle Ages which could have added carbon material, resulting in a higher radiocarbon content and a later calculated age.
这块裹尸布在中世纪后期遭到火灾破坏，也可能会增加另外的碳元素，这样会产生高放射性的碳素使计算的年代有所延迟。
Because we know how fast radiocarbon decays, we can figure out the age of the organic material.
因为我们知道放射性碳分解有多快，我们就能计算出有机材料的年龄。
A strange manuscript found inside and the unusually age-worn chest coupled with its noticeably unique design prompted them to conduct a radiocarbon test of the timber with which the chest was made.
结果发现里面有一份手稿，而箱子实在很古老，用来制作箱子的木材也十分奇特，于是决定用放射性碳来测算它的年代。
A strange manuscript found inside and the unusually age-worn chest coupled with its noticeably unique design prompted them to conduct a radiocarbon test of the timber with which the chest was made.
结果发现里面有一份手稿，而箱子实在很古老，用来制作箱子的木材也十分奇特，于是决定用放射性碳来测算它的年代。
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