当时身无分文的J·K·罗琳坐在火车上，脑子里有了这个想法，她把这个想法构思成共有七本书的系列，每书写的是在霍格沃茨魔法学校里的一年发生的事。
She imagined his story as a series of seven books, each spanning a year at the Hogwarts School of Witchcraft and Wizardry.
本文介绍了L系列罗茨鼓风机在氢气输送过程中替代液环泵的优势与特点。
This paper introduced the advantage and characteristic of L-series roots blower, which could substitute the liquid ring pump in the process of hydrogen transportation.
为不断完善转子型线参数，实现罗茨泵系列化设计、生产，满足敏捷制造技术需要奠定基础。
Establishing the foundation to improve the rotor shape parameter dramatically, realizing the Roots pump series design and production, sufficing the condition of the agile manufacturing technology.
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