Literally from the Latin ‘in every hundred’, so it is a fraction with the denominator of 100 replaced by this phrase or by the symbol %. So 20 per cent = 20% = 20/100 which is 1/5 or 0.2.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。