To aid in conversion, you can upgrade a filesystem from ext3 to Btrfs (and also back, but only to the point at which conversion was done).
为了协助转化，可以将文件系统从ext3升级到Btrfs(反之亦然，但只能在实现转化之后)。
2
Bidirectional data conversion of model drawing and data file is supplied, and it can communicate with many finite element system or user programmed system.
系统还配有图形和数据的双向转化功能，可以和现有的多种有限元分析系统或者用户的结构分析系统对接。
3
The system is mainly composed of file module of reading data, creation module of NURBS curve, surface construction module, parameterization modifying module, data conversion module and user interface.