“principal direction”概念、定义、翻译-科学时代

单词	principal direction
释义	力学词汇手册 principal direction 主方向
随便看	negative prescription negative pressure negative pressure regulation of boiler furnace negative pressure trousers negative priming negative profit negative pronoun negative proposition negative proton negative proton negative pulse negative pulse negative punishment negative question negative raising negative reactivity negative reciprocity negative reciprocity negative reference group negative reinforcement negative reinforcement negative reinforcement negative reinforcement negative reinforcement negative relationship

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。