Two workers in orange vests perform their job.
Two men at work.
Workers implies people are at work.
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_perform(e1) & n_job(x4) & of(x4,x1) & n_thing(x1) & in(x1,x2) & n_vest(x2) & of(x2,x3) & n_orange(x3) & n_worker(x1) & card_eq_2(x1))
exists x1 x2.(a_topic(x1) & at(x1,x2) & n_work(x2) & n_man(x1) & card_eq_2(x1))