A case falling within the grey area or twilight zone of application of some term. Within classical logic it is not easy to understand and formalize the pervasive possibility of such cases. See vagueness, sorites paradox.
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。