“周线”概念、定义、翻译-科学时代

单词	周线
释义	数学词汇手册周线 contour
随便看	earphone impedance earphone jack earphone monitoring earpiece earpiece earplug ear plug earplug ear protector ear puncher earring earrings ears ear-shaped twists with sugar ear shell earshot ear tag earth earth earth earth earth earth earth earth

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。