Two Asian girls laughing, as the girl on the right holds an instrument.
Two Asian girls are laughing at a girl holding an instrument.
We know that the girls are laughing, and that the other girl holds an instrument. Unless something else funny is happening, the inference is that they are laughing at the other girl.
exists e1 p1 s1 x1 x2 x3.(n_right(x3) & a_topic(x1) & exists e2 x4.(Theme(e2,x4) & Actor(e2,x1) & v_hold(e2) & n_instrument(x4) & on(x1,x3)) & n_girl(x1) & n_girl(x1) & as(e1,p1) & Actor(e1,x2) & v_laugh(e1) & (x1 = x2) & a_asian(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 e2 s1 x1 x2 x3 x4.(at(e1,x2) & Theme(e2,x4) & Actor(e2,x3) & v_hold(e2) & n_instrument(x4) & (x2 = x3) & n_girl(x2) & Actor(e1,x1) & v_laugh(e1) & n_girl(x1) & a_asian(s1) & Theme(s1,x1) & card_eq_2(x1))