In another case, American archaeologists Rene Million and George Cowgill spent years systematically mapping the entire city of Teotihuacan in the Valley of Mexico near what is now Mexico City.

再举个实例，美国考古学家勒内·米利翁和乔治·考吉尔花费数年时间对位于今墨西哥城附近的墨西哥谷中的整个特奥蒂瓦坎城进行了系统测绘。