Indeed, indexes created over compressed tables are themselves compressed by default.

实际上，在默认情况下，在压缩的表上创建的索引本身也是压缩的。

youdao

Aside from compression artifacts, the cable version has other problems too, like cropping and over compressed audio -- both of which are enough to make us yearn for DVD.

ENGADGET: Sizing up Apple TV (take 2)'s HD HD

Obviously we're not the only ones not buying these overpriced, over-compressed videos, and for good reason.

ENGADGET: Amazon & iTunes drop digital download prices. Still cost too much

The hydraulic compression of the waves compressed me over a period of three seconds until I heard three bones fracturing in my shoulders.

FORBES: Larry Ellison