These girls are in uniforms and are playing field hockey.
Girls in casual clothing playing a sport.
Casual clothing is not the same as uniforms.
exists e1 p1 x1 x2 x3.(n_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_hockey(x2) & of(x2,x3) & n_field(x3) & exists x4.(in(x1,x4) & n_uniform(x4)))
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_sport(x3) & in(x1,x2) & n_clothing(x2) & a_casual(s1) & Theme(s1,x2) & n_girl(x1))