放射性碳显示这个头颅的年龄符合国王的死期。
Radiocarbon dating showed that the head's age matched the king's date of death.
不同的实验室正在对这些猛犸象骨骼进行放射性碳测定，以更加精确地得知这些化石的年龄。
Various labs are doing radiocarbon-dating of the bones to more precisely date them.
对放射性同位素衰变的测量，尤其是铀、锶、铷、氩和碳，可允许地质学家更精确地确定岩层的年龄。
The measurement of the decay of radioactive isotopes, especially uranium, strontium, rubidium, argon and carbon, has allowed geologists to more precisely determine the age of rock formations.
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