Skeletochronology is used to determine the chronological age of a species of animal by counting the concentric growth rings found in a cross section of bone. This technique cannot be used for all species of bony animals.
英汉双解词典包含3185865条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。