“ladder development theory”概念、定义、翻译-科学时代

单词	ladder development theory
释义	地理学词汇手册 ladder development theory 梯度理论
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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。