然后另外存储这个修改后的版本，与原始版本区分开。
The modified version is then stored separate from the original version.
额外存储器是空的。
当数据值压缩过后仍然太大将会采用行外存储。
After data value has been compressed too big still will use the memory outside travel.
首先进行压缩，如果行仍然太大，则进行行外存储。
Undertake compression above all, if travel is too big still, have the memory outside travel.
首先进行压缩，如果行仍然太大，则进行行外存储。
Undertake compression above all, if travel is too big still, have the memory outside travel.
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