They are not common friends, that is to say, they have special relation.
他们不是普通朋友，也就是说，他们有着特殊的关系。
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No relation of all this to fractals is known, but in my work I've found that they do have a common property, that is, a non-integer dimension (at some scale).
Distributed relation database architecture (DRDA) is the common protocol used for communication between the client and the server, and is provided by the Runtime client.