compact Riemann surface

例句：

1. 1.The new design is compact and easy to use.
   新设计紧凑且易于使用。
2. 2. The car was compact enough to fit in the small space.
   这辆车足够紧凑，能放进小空间。
3. 3. The data was compacted into a single file for quick access.
   数据被压缩成单个文件以便快速访问。