“N. A.--N. A. (not available)”概念、定义、翻译-科学时代

单词	N. A.--N. A. (not available)
释义	水利水电词汇手册 N. A. (not available) 无数据的，无资料的；不可利用的；不可得到的
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科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。

N. A. (not available)