这是键索引对象，当脚本在目录中进行递归时，文件添加到其中。

This is the key indexing object to which files will be added as the script recurses through directories.

youdao

通常，调用规则的代码需要确保会话中存在对应于预期键的对象。

It is generally up to the code calling the rule to make sure that the object exists on the session at the expected key.

youdao

此外，根对象的键并不仅限于字符串。

Also, the keys of the root object aren't limited to strings.

youdao