Two construction workers sitting on some pipes while one waves, obscuring his face.
Two construction workers are sitting on some pipes.
The second sentence rephrases that there are two workers sitting on pipes.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7.(Theme(e2,x7) & Actor(e2,x5) & v_obscure(e2) & n_face(x7) & of(x7,x2) & n_male(x2) & n_worker(x5) & of(x5,x6) & n_construction(x6) & card_eq_2(x5) & while(e1,x4) & n_wave(x4) & card_eq_1(x4) & on(e1,x3) & n_pipe(x3) & Actor(e1,x1) & v_sit(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))
exists e1 x1 x2 x3.(on(e1,x3) & n_pipe(x3) & Actor(e1,x1) & v_sit(e1) & n_worker(x1) & of(x1,x2) & n_construction(x2) & card_eq_2(x1))