“清底--石块铺底”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	清底--石块铺底
释义	水利水电词汇手册 bottoming 清底，石块铺底
随便看	difference frequency difference frequency difference frequency fluctuation difference frequency generation difference hypothesis difference image difference in conditions insurance difference in differences difference in differences (DID) difference in differences--difference in differences (DID) difference in price difference in regional price levels difference ionization chamber difference limen difference limen difference linear ratemeter difference marketing difference marketing difference method difference method difference method difference of ability difference of aesthetic perception difference of elevation difference of events

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