“Slavery in the United States”的概念、定义、翻译、参考文献-科学参考

单词	Slavery in the United States
释义	Slavery in the United States Encyclopedia 历史学美国历史释 Slavery in the United States美国奴隶制在美国历史上长期持续的人身奴役制度，受奴役的对象主要来自非洲的强制移民及其后代。
随便看	effective network effective nuclear charge effective number effective numbering effective number of neutron effective number of replications effective operator effective optical depth Effective Output effective parameter effective path effective phonon spectrum effective photon approximation effective plate height effective population effective population size effective potential effective power effective pressure effective pressure law effective prestress effective problem effective procedure effective process effective properties of composites

科学参考收录了854744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。