音标: 英 [ˌreɪdɪəʊˈkɑ:bən] 美 [ˌredɪoˈkɑrbən]
1. Best guess is from work we've done with the sediments where we've done radiocarbon dating to actually see how old these sediments are, and we know that they are at least 10,000 years old, so that collapse is probably 10,000 years old at a minimum.
根据我们对这里的沉积物所做的 放射性碳年代测定的结果 我们就能猜出这些沉积物的年龄 我们得知 沉淀物至少已经存在了一万年 所以塌陷最少也是一万年前的事了