Active galaxies give off bright radiation from their cores, where gas heats up as it is compressed into a swirling accretion disk encircling the black hole.

活动星系从它们的核部发出明亮的光芒，在那里，气体被加热并压缩成一个漩涡状的圆盘，漩涡的中心便是黑洞。

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The compressed data is kept both on disk and memory and DB2 also compresses user data stored in log files, thereby reducing log file size.

被压缩的数据同时存放在磁盘上和内存中，DB2 还压缩存储在日志文件中的用户数据，以便减少日志文件大小。

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The file is typically in a compressed format—specifically, the file grows and shrinks with the contents of the VMI and is not defined by the capacity of the VM's hard disk.

这个文件通常采用压缩格式 — 尤其是，该文件并不是根据 VM 的硬盘容量确定的，它的大小随着 VMI 的内容变化。

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Finally the camera stores the compressed image file on anything from a flash memory card to a floppy disk for later downloading to a computer or printer.

FORBES: Technology briefing