According to carbon dating, millet and rice in China and southeastern Asia were domesticated about 3000 BC: and corn and beans in Mexico about 7000bc.

根据碳测定，小米和大米在中国和东南亚是在公元前大约3000年驯化，而玉米和豆类在墨西哥则是在公元前7000年驯化。

youdao

According to the result of environment tritium math-physical model and carbon-14 age dating, think the renew ability of the thermal water in study area is confined and inhomogeneity.

根据环境氚的数学物理模型计算和碳- 14测年结果，关中盆地热水可更新性具有有限性和非均一性特点。

youdao