People standing in front of mechanical equipment.
People are in front of mechanical equipment.
standing in front of mechanical equipment implies that People are in front of mechanical equipment
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x3) & of(x3,x4) & n_equipment(x4) & a_mechanical(s1) & Theme(s1,x4) & n_front(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1))
exists p1 x1.(exists s1 x2 x3.(in(x1,x2) & of(x2,x3) & n_equipment(x3) & a_mechanical(s1) & Theme(s1,x3) & n_front(x2)) & n_people(x1))