一种碳的天然放射性同位素，原子量为4，半衰期为5，780年，用于测定古代生物标本，地质标本或考古遗迹的标本的年代。

A naturally radioactive carbon isotope with atomic mass 4 and half-life 5,780 years, used in determining the age of ancient organic, geologic, or archaeological specimens.

youdao

该遗址位于当时平原河流的天然堤上，是古人类在河边进行短期活动留下的遗迹。

P…This site is located on a plaeo levee of a river and is a place of ancient human activity during a short period.

youdao

该遗址位于当时平原河流的天然堤上，是古人类在河边进行短期活动留下的遗迹。

P…This site is located on a plaeo levee of a river and is a place of ancient human activity during a short period.

youdao