当Linux关闭时，它仔细地把所有的缓冲区数据转送到磁盘，并确保文件系统被彻底卸载，以保证系统再次启动时能够使用。
When Linux shuts down, it carefully flushes all cached data to disk and ensures that the filesystem is cleanly unmounted, so that it's ready for use when the system starts up again.
当Linux关闭时，它仔细地把所有的缓冲区数据转送到磁盘，并确保文件系统被彻底卸载，以保证系统再次启动时能够使用。
When Linux shuts down, it carefully flushes all cached data to disk and ensures that the filesystem is cleanly unmounted, so that it's ready for use when the system starts up again.
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