The range of sound frequencies that are audible to the human ear. This is typically considered to be the range from 20 to 20 000 hertz, a span of eleven octaves.
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。