请输入您要查询的英文单词:

 

单词 k-t boundary
释义 k-t boundary
noun
Usage: usually capitalized K&T
Etymology: K (alternative for C as abbreviation for Cretaceous) + Tertiary
: the transition between the Cretaceous and Tertiary periods of geologic time characterized by a mass extinction of many forms of life including the dinosaurs ; also : a geologic stratum marking this transition
随便看

 

英语词典包含332784条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2022 Newdu.com All Rights Reserved
更新时间:2025/3/21 13:54:24