premise: Two middle-aged police officers watch over a parking lot, at night.
hypothesis: A couple cops keep an eye on the parking lot.
explanation_1: Keep an eye on and watch over are roughly synonymous.
explanation_2: Two middle-aged police is inferred as A couple cops and  watch over is inferred as keep an eye.
explanation_3: They are a cops because they are police officers.
premise_logic: exists e1 s1 x1 x2 x3 x4 x5.(at(e1,x5) & n_night(x5) & Theme(e1,x3) & Actor(e1,x1) & v_watch(e1) & r_over(x3) & n_lot(x3) & of(x3,x4) & n_parking(x4) & n_officer(x1) & of(x1,x2) & n_police(x2) & a_middle-aged(s1) & Theme(s1,x1) & card_eq_2(x1))
hypothesis_logic: exists e1 p1 x1 x3 x4.(n_lot(x3) & of(x3,x4) & n_parking(x4) & exists e2 x2.(on(e2,x3) & Theme(e2,x2) & Actor(e2,x1) & v_keep(e2) & n_eye(x2)) & Topic(e1,p1) & Actor(e1,x1) & v_cop(e1) & n_couple(x1))