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

单词	parts per billion (ppb)
释义	请查阅parts per billion--parts per billion (ppb)
随便看	double track heading double-track schooling double transit double tree double trisomy double truck double truck double truth doublet splitting double tube core barrel double twin double twine double two high rolling mill doublet Ⅲ double U groove double unilineal double unilineal descent double union double unit double universal joint double-up method double up post double uranium fluoride double-used grassland double vacuum process

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。