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。
Ext4 is forward compatible in that you can mount an ext3 file system as an ext4 file system.
Ext4文件系统被设计为具有向前和向后兼容性，但它具有许多新的高级特性(其中的一些特性破坏了兼容性)。
The ext4 file system is designed as a backward - and forward-compliant replacement for ext3fs but with many new advanced features (some of which break the compatibility).
凯文把拴在死树上的导索展开，将其另一端固定在他的货车上并向前牵引拉紧。
From the dead tree, Kevin uncurled the guide rope, anchored the other end to his van and pulled forward to tighten it.
德尚表示他并没有后悔执教尤文，他表示应该向前看。
Deschamps has not once regretted his decision to accept to train Juventus and is ready to look ahead.
德尚表示他并没有后悔执教尤文，他表示应该向前看。
Deschamps has not once regretted his decision to accept to train Juventus and is ready to look ahead.
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