尤卡坦半岛失去的文明古遗址奇琴伊察，一座由神秘玛雅人建造的金字塔隐现在破云而出的阳光下。

A pyramid built by the mysterious Maya looms against sunburst clouds in Chichén Itzá, a postclassic site of the lost civilization on the Yucatán Peninsula.

youdao

时间树由宾夕法尼亚州立大学的布莱尔•赫奇斯和亚利桑那州立大学的古普塔•库马尔共同开发。

Time Tree is jointly run by Penn State’s Blair Hedges and Arizona State’s Sudhir Kumar.

youdao

时间树由宾夕法尼亚州立大学的布莱尔·赫奇斯和亚利桑那州立大学的古普塔·库马尔共同开发。

Time Tree is jointly run by Penn State's Blair Hedges and Arizona State's Sudhir Kumar.

youdao