这种不同可能会更改应用程序的设计，或者对即付即用用户采用不同的定价结构。
This difference may change the design of the application, or suggest a different pricing structure for a Pay-As-You-Go user.
但安装开源软件就自由得多，无需付会员费，而且文件格式及数据结构都是公开的。
But with open-source software there was much less of a lock-in. There are no licence fees, and the file formats and data structures are open.
本文阐述了用于大型天文光学望远镜主、付镜的气压、液压支承的运行原理及结构形式和设计方法。
Hydrostatic and pneumatic supports of telescope mirror are described for its operating principle, structure type and design.
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