A lady is looking at a specimen with a microscope.
A scientist eating lunch.
A scientist can't be eating lunch at the same time than looking with a microscope.
exists e1 x1 x2 x3.(at(e1,x2) & with(x2,x3) & n_microscope(x3) & n_specimen(x2) & Actor(e1,x1) & v_look(e1) & n_lady(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_eat(e1) & n_lunch(x3) & (x1 = x2) & n_scientist(x1))