Ext4 is forward compatible in that you can mount an ext3 file system as an ext4 file system.

ext4与ext3是向前兼容的，这样就可以将ext3文件系统挂载为ext4文件系统。

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For this reason, ext4 was designed to be both forward and backward (to an extent) compatible (see Figure 1).

为此，ext4被设计为在extent方面具有向后和向前兼容性(参见图1)。

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Because of the importance and difficulty in achieving forward compatibility, one of the major goals in XML schema 1.1 is to make it easy to write forward compatible schemas.

由于获得向前兼容性很重要，也比较困难，所以XML Schema 1.1中的主要目标之一就是让编写向前兼容的模式更为容易。

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Uhrman assured us that "all the games will be backward compatible" going forward.

ENGADGET

Players are encouraged to forward the game to friends to look for compatible travel pals.

FORBES: You Play, They Win

Budding filmmakers might reasonably prefer to shoot their low-budget masterpieces in a snappy forward-looking format instead of a fuzzy one compatible with a 50-year-old TV.

FORBES: Pixel-Packin' Camcorder