A woman in black is explaining a diagram.
A woman is talking about a diagram.
Explaining a diagram is a form of talking about a diagram.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_explain(e1) & n_diagram(x3) & in(x1,x2) & n_black(x2) & n_woman(x1))
exists e1 x1 x2.(about(e1,x2) & n_diagram(x2) & Actor(e1,x1) & v_talk(e1) & n_woman(x1))