“标志”概念、定义、翻译-科学时代

科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。

单词	标志
释义	请查阅标志--符号
随便看	boundary maintenance mechanism boundary map boundary mark boundary mark boundary marker boundary marking boundary material boundary method boundary method boundary monument boundary monument boundary node boundary node boundary of a set boundary of human knowledge boundary of nuclear explosion fireball boundary operation boundary point boundary point boundary point boundary point boundary point boundary porosity boundary problem boundary relation