These are very helpful and can be used to discover the origin of the document, such as the collection (SRC: col) and key (SRC: key).
这些属性非常有用，可以用来发现文档的出处，例如集合(src：col)和键(src：key)。
These are very helpful and can be used to discover the origin of the document, such as the collection (SRC: col) and key (SRC: key).
这些属性非常有用，可以用来发现文档的出处，例如集合(src：col)和键(src：key)。
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