“PPM（portable people meter）”概念、定义、翻译-科学时代

单词	PPM（portable people meter）
释义	新闻与传播词汇手册 PPM（portable people meter）便携式收视测量仪
随便看	rail shifting machine railship rail steel rail straightener rail tank car rail-trailer shipment rail transfer rail transit rail transit rail transport rail transport rail transport rail transport rail transportation rail transport document rail transporter rail-water rate rail-water terminal railway railway advice railway advice railway advice railway bill railway bill of lading railway bill of lading

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。