A research team in China recently determined that four large dinosaur teeth discovered in the Sanshui Basin in South China's Guangdong province belong to the same group of carnivorous, bipedal dinosaurs as Tyrannosaurus rex.
中国的一个研究小组最近确定，在中国南方广东省三水盆地发现的四颗大型恐龙牙齿与霸王龙属于同一类肉食性双足恐龙。

This finding was published in the international geological journal Cretaceous Research on Thursday.
这一发现周四发表在国际地质杂志《白垩纪研究》上。

Xing Lida, an associate professor at China University of Geosciences Beijing, who led the research, said the fossilized teeth found in the cities of Sihui and Guangzhou date back to the end of the Late Cretaceous period, approximately 66 to 70 million years ago.
领导这项研究的中国地质大学北京分校副教授邢立达表示，在四会和广州发现的牙齿化石可以追溯到晚白垩世末期，距今约66至7000万年。

South China lacks evidence of large theropod dinosaurs from the Late Cretaceous, with the teeth found in the basin marking the first discovery of large theropod dinosaurs in the area and one of the southernmost fossil records of the Tyrannosauroidea in China.
华南地区缺乏晚白垩世大型兽脚亚目恐龙的证据，盆地中发现的牙齿标志着该地区首次发现大型兽脚亚目恐龙，也是中国最南端的霸王龙化石记录之一。

It is also one of the most recent records of the Tyrannosauroidea in China, Xing said.
邢说，这也是中国对暴龙科的最新记录之一。

He said dinosaur egg fossils from the Late Cretaceous period discovered in the basin also indicate that dinosaurs belonging to groups including the Troodontidae, Oviraptorosauria and Hadrosauridae lived in the region.
他说，在该盆地发现的白垩纪晚期的恐龙蛋化石也表明，伤齿龙科、偷蛋龙科和鸭嘴龙科等恐龙曾生活在该地区。

"The discovery of teeth from the Tyrannosauroidea alongside these taxons forms a dinosaur biota, suggesting that the dinosaur biota in southern China was likely quite prosperous toward the end of the Cretaceous before the major extinction event," Xing said.
邢说：“在暴龙总科中发现的牙齿与这些分类群一起形成了恐龙生物群，这表明中国南方的恐龙生物群可能在白垩纪末重大灭绝事件之前相当繁荣。”

Xing said theropod dinosaur teeth typically have a banana or crescent shape, wider in the middle and narrower toward the edges. The three relatively intact teeth found in Sihui each exceed 6 centimeters in crown length, while tooth fragments were found in Guangzhou.
邢说，兽脚类恐龙的牙齿通常呈香蕉形或新月形，中间较宽，边缘较窄。 四会发现的三颗相对完整的牙齿，冠长均超过6厘米，而广州则发现了牙齿碎片。

The research team, with members from China University of Geosciences Beijing, the Sihui City Museum, Sun Yat-sen University and the Guangdong-Hong Kong-Macau Institute of Earth Sciences, analyzed 145 features from 97 theropod species, with the results supporting the classification of the four teeth as belonging to the Tyrannosauroidea.
由中国地质大学（北京）、四会市博物馆、中山大学和粤港澳地球科学研究所等单位组成的研究小组，对97种兽脚类恐龙的145个特征进行了分析，结果支持了分类 属于暴龙科的四颗牙齿。

The primary author of the paper, doctoral student Wang Donghao from China University of Geosciences Beijing, estimated that the dinosaur to which the teeth found in Sihui belonged was at least 5 to 6 meters long.
该论文的主要作者、北京地质大学的博士生王东浩估计，四会发现的牙齿所属的恐龙至少有5至6米长。