Age determination data indicate episodic crystallization of uranium minerals. 年龄测定数据表明,铀矿物有着不同期的结晶。
The team used several methods to date a variety of material from the site near Puebla, Mexico, in order to be sure they were right about the age. 该小组运用多种方法对墨西哥普埃布拉附近遗址的各种物质进行了年代测定,以此确保他们得出的结果是正确的。