“百万分率”概念、定义、翻译-科学时代

单词	百万分率
释义	化工词汇手册百万分率 ppm (parts per million)
随便看	student welfare student who joins a class in the middle of a course student who majors in commerce student with high intelligence student work student work skill knowledge evaluation student writing model stud-horse studied object studies of Chinese ancient civilization （including philosophy，history，archaeology，literature，linguistics，etc） studio studio studio studio studio and control room studio-apartment studio architect studio audience studio camera studio complex studio control studio decoration studio designer studio electrician studio fitting

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。