Men working on a cylinder in a factory.
Men are working on a rocket in a factory.
The men are working on a cylinder in a factory but it isn't necessarily for a rocket.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_factory(x4) & on(e1,x3) & n_cylinder(x3) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_factory(x3) & on(e1,x2) & n_rocket(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1))