“hard??-to-find book”概念、定义、翻译-科学时代

单词	hard??-to-find book
释义	出版印刷词汇手册 hard??-to-find book 绝版书，孤本
随便看	caveat emptor caveat emptor caveat emptor caveat emptor cave attack cave breccia cave deposit cave deposit caved stope cave-dweller cave dwelling cave dwelling cave dwelling cave fortification cave-in cavella Cavell，Edith cave man caveman cave notch cave painting cave painting cave period caverniloquy cavernositis

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。