热热热久久久免费视频|第四色五月婷婷五月天AV|日韩高清无码免费一级大片|日本成人手机在线视频|中文字幕无码Av在线|台湾a级别黄片免费看|欧美一级性爱亚洲第一性爱|A级黄色电影久草大|www.91精品视频|亚洲AV资源欧洲无码在线观

單詞乎

carbon dating

carbon dating是什么意思、carbon dating怎么讀

carbon dating漢語翻譯

【化】 碳(14)測定年代

carbon dating詞型變化

動詞:carbon-date 

carbon dating英語解釋

名詞 carbon dating:

  1. a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-14; believed to be reliable up to 40,000 years
    同義詞:radiocarbon dating, carbon-14 dating
0
糾錯