One of the two regions into which a plane divides 3‐dimensional space. The half-space is said to be closed or open depending on whether it includes the dividing plane or not.
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。