成年德牧对于陌生人的保留态度，既不逃避也不进攻，这完全正确。
It is entirely correct for a mature GSD to be reserved with strangers, showing neither avoidance nor aggression.
对于它所了解和热爱的人，具有坚定的忠诚。而对于陌生人，则表现出典型的戒备和保留。
While he is firmly loyal to those he knows and loves, he typically exhibits reserve with strangers.
这种非常有勇气的狗很忠于他的主人，而且对于他的家人很温顺，但对于陌生人就另当别论。
This extremely courageous dog is very loyal to its master and docile with the rest of the family, but reserved with strangers.
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