“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	two-group critical mass two-group diffusion theory two-group model two group model two-group perturbation theory two-group theory two group theory two-gun oscillograph two-heading entry two-hinged arch two-hinged arch two-house legislature two-image photogrammetry Two Immortals Powder two-income family two-income family Two-Ingredient Galenite Elixir two-input adder two-input gate two-input servo two-input subtracter two-input switch two-intakes two-integrator plant two intestines

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。