<classify> Lokhu kubangela ukuthi abashushuluzi baphenduke. Uma izishushuluziziphenukela ngakwesokudla, umshushuluzi uphendukela ngakwesokudla, uma izishushuluzi ziphendukela ngakwesobunxele, umshushuluzi uphenukela ngakwesobunxele.  <topic>: how things work, ice skates 