A man wearing a red shirt, jeans, and a black cowboy hat is welding on metal bars.
A man is working on something
working on something is a less specific way of saying welding on metal bars.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(on(e2,x8) & n_bar(x8) & of(x8,x9) & n_metal(x9) & Actor(e2,x1) & v_weld(e2) & subset_of(x6,x1) & n_hat(x6) & of(x6,x7) & n_cowboy(x7) & a_black(s2) & Theme(s2,x6) & subset_of(x2,x1) & Theme(e1,x4) & Actor(e1,x3) & v_wear(e1) & rel(x4,x5) & n_jeans(x5) & n_shirt(x4) & a_red(s1) & Theme(s1,x4) & (x2 = x3) & n_man(x2))
exists e1 x1 x2.(on(e1,x2) & n_thing(x2) & Actor(e1,x1) & v_work(e1) & n_man(x1))