The central slogan of existentialism, indicating that a person has no predetermined nature or range of choices, but is always free to choose afresh, and thereby reconstitute himself or herself as a different person.
科学参考收录了60776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。