“自然音域”的概念、定义、翻译、参考文献-科学参考

单词	自然音域
释义	自然音域 Encyclopedia 文学口语播音释 natural range自然音域不经过专门训练，就能以自己的嗓音自然流畅地发出声音的高度范围。
随便看	closed curve closed-curve problem closed cycle closed cycle engine closed-cycle refrigerator closed differential closed differential field closed differential form closed differential relation closed disk closed domain closed drain system closed-easy-axis closed economy closed ecosystem closed edge sequence closed edge train closed elastic drive closed element closed embedding closed-end fund closed equivalence relation closed expression closed extension closed family of sets

科学参考收录了854744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。