科学家通过碳测年判定这些古代种子已有五千年的历史。

Scientists ___carbon-dated these ancient seeds and found them to be 5,000 years old.

我们开玩笑说他的Windows 98电脑应该做碳测年，因为它太古老了。

We joked that his Windows 98 computer should be ___carbon-dated because it's so ancient.