y (year)
1. In mathematics, the symbol for an unknown quantity, person, factor, or thing.Y is the second in a set of two or three unknowns comprising x, y, and z. See also x, y-axis, and z. 2. The abbreviation for year. See yy and yyyy.
科学参考收录了5291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。