third period; tertiary (geological era since the extinction of the dinosaurs at the Cretaceous-Tertiary boundary 65 million years ago)
trad. 第三紀
Also written 第三紀【dì sān jì】
third period; tertiary (geological era since the extinction of the dinosaurs at the Cretaceous-Tertiary boundary 65 million years ago)
trad. 第三紀
Also written 第三紀【dì sān jì】