A team of girls competing on rollerskates.
A group riding on skates.
A group can be a team, and rollerskates is a more specific term than just skates.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & on(e1,x4) & n_rollerskate(x4) & Actor(e1,x3) & v_compete(e1) & (x2 = x3) & n_girl(x2) & n_team(x1))
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_skate(x3) & Actor(e1,x2) & v_ride(e1) & (x1 = x2) & n_group(x1))