A man with glasses working in a laboratory.
The class cleans up after a chemical explosion in the lab.
The class implies multiple people, not just a man.
exists e1 x1 x2 x3 x4.(a_topic(x1) & with(x1,x2) & in(e1,x4) & n_laboratory(x4) & Actor(e1,x3) & v_work(e1) & (x2 = x3) & n_glass(x2) & n_man(x1))
exists e1 s1 x1 x2 x3 x4.(n_lab(x4) & n_class(x1) & after(e1,x2) & in(x2,x4) & n_explosion(x2) & of(x2,x3) & n_chemical(x3) & a_up(s1) & Manner(e1,s1) & Actor(e1,x1) & v_clean(e1))