“ppb--ppb (parts per billion)”概念、定义、翻译-科学时代

单词	ppb--ppb (parts per billion)
释义	水利水电词汇手册 ppb (parts per billion) 十亿分率，十亿分之
随便看	hard budget constraint hard burning hard-burnt hard butter hard cake hard call protection hard candy hard candy hard cash hard cash hard cherry hard cider hard clipping hard c-means algorithm hard c-means clustering hard coal hard coating hard-coded hard commodity hard commodity hard component hard component of cosmic rays hard copy hard copy hard copy

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。

ppb (parts per billion)