This is the 15148th most frequent Russian word.
полосками
"Полосками" means "in stripes" or "striped."
In this sentence, 'полосками' is used to specify the shape or form (strips) the paper has been cut into.
Я нарезал бумагу полосками.
I cut paper into strips.
Here, 'полосками' describes the shape of the vegetables present in the soup, indicating they are sliced into strips.
В супе плавают овощи полосками.
Vegetables cut into strips are floating in the soup.
In this instance, 'полосками' refers to the appearance of stripe-like patterns on the fabric.