Man working on the railroad in a railroad station.
The man is working on a patient
Man is a general statement while The man is allot more specific statement.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_station(x4) & of(x4,x3) & n_railroad(x3) & n_railroad(x3) & on(e1,x3) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & on(e1,x2) & n_patient(x2) & Actor(e1,x1) & v_work(e1))