These girls are in uniforms and are playing field hockey.
the girls are athletes
In uniforms and playing field hockey does not mean they are athletes.
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 p1 x1.(n_girl(x1) & exists x2.((x1 = x2) & n_athlete(x2)))