atime 是最近访问文件的时间，每当访问文件时，底层文件系统必须记录这个时间戳。
The atime is the last access time of a file, and each time a file is accessed, the underlying file system must record this timestamp.
另外还请注意，NFS在每个客户端系统中维护缓存，其中包含最近访问的文件和目录的属性。
Note also that NFS maintains caches on each client system that contain attributes of the most recently accessed files and directories.
这种持久性使解析器能够只分析最近更改的文件就能访问项目中存储的元素。
This persistence enables the parser to access stored elements in a project while only analyzing files that have recently changed.
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