DB2的行压缩不像Oracle的键压缩，它不需要指定键。

DB2's row compression, unlike Oracle's key compression, does not require keys to be specified.

youdao

级别(通常有16个)本质上是快捷键，用于在压缩时限制不同的视频组件。

The levels, of which there are 16, are essentially shortcuts to constrain different video components when compressing.

youdao

控键会被压缩进这些角落中，不至于影响在屏幕中央的战斗区域。

The controls felt right pressed into these corners so as not to obscure the center combat area of the screen.

youdao