“定级证书”概念、定义、翻译-科学时代

单词	定级证书
释义	航空航天词汇手册 grading certificate 定级证书
随便看	sex chromatin sex chromosome sex chromosome sex chromosome sex chromosome sex chromosome sex complex sex composition sex composition sex conflict sex-controlled trait sex control technique sex determination sex determination sex determination sex determination sex deviation sex difference sex difference sex difference in learning sex difference in speech sex differentiation sex differentiation sex differentiation sex dimorphism

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。

grading certificate