A guy looking in a microscope.
The man examining tissue.
Looking in a microscope does not necessarily mean one is examining tissue.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_microscope(x3) & Actor(e1,x2) & v_look(e1) & (x1 = x2) & n_guy(x1))
exists e1 x1 x2 x3.(n_man(x1) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_examine(e1) & n_tissue(x3) & (x1 = x2))