A scientist in a lab coat is using a microscope.
A young woman using a microscope.
Just because a scientist is in a lab coat doesn't mean they are a young woman.
exists e1 x1 x2 x3 x4.(Theme(e1,x4) & Actor(e1,x1) & v_use(e1) & n_microscope(x4) & in(x1,x2) & n_coat(x2) & of(x2,x3) & n_lab(x3) & n_scientist(x1))
exists e1 s1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_use(e1) & n_microscope(x3) & (x1 = x2) & n_woman(x1) & a_young(s1) & Theme(s1,x1))