misc. excessive rolling
但要知道，用户“看到”的是已经压缩过的数据，会用HANA的结果与之相比。
But remember, customers "sees" already compressed data and will be comparing HANA's result to that.
图片通常已经是压缩过的，因此压缩应仅限于文本输出。
Images are generally already compressed, so compression should be limited to text output.
还有一点也很明显，Subversion不能压缩已经压缩过的文件。
It's also clear that Subversion cannot compress an already compressed file.
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