The technique that the strings are employing in this excerpt is pizzicato.
The "Dance of the sugar plum" is simply a dance for a ballerina. It is typically danced by female dancers. The dance is a sense of dynamic build-up. The song combines homophonic and polyphonic pieces.
Pizzicato refers to plucking the string of a violin or any other stringed instrument with one's finger. To play pizzicato on a stringed instrument means to make the notes sound simply by plucking the strings with the fingers.
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