In fact the translation is very clear, but i do not understand it in the context.
To me trimming means, making something fit.
To match means, about the same, maybe more in a sense of letting things meet.
Well, i just do not know what exactly happens to surfaces and curves , when building a NURB and what NURBs really are.+
And so on.

By the way, stay cool- trimming in german is nothing filthy