For the following question of mine, Herbert Voss submitted his answer. His answer is always too short in description. Please help me digest the essence of his answer more deeply.

What is the correlation of the italic keywords in his statement "Nodes are saved in an own dictionary which also saves the current transformation matrix which is restored when using \psGetNodeCenter."?

I should present my condition in which I don't know the keywords.

I also gave a comment below his answer, asking why the first argument of \uput does not need the same treatment as the second argument.

Having not enough knowledge of the internal mechanism of PSTricks makes me not quite confident to type the codes. I always do some experiments outside the black box to determine the behavior in it.

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It seems my room has been used as a place to rest for a moment. There are some visitors but without any response.