A child with a floatation vest is being bounced off of something.
A child is wearing a safety vest.
Safety vest is a different phrase meaning floatation vest.
exists e1 x1 x2 x3 x4.(r_off(e1) & of(e1,x4) & n_thing(x4) & Theme(e1,x1) & v_bounce(e1) & with(x1,x2) & n_vest(x2) & of(x2,x3) & n_floatation(x3) & n_child(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_vest(x2) & of(x2,x3) & n_safety(x3) & n_child(x1))