A man in a black shirt and jeans appears to be working on some piping system.
The contractor inspects the water cooling system.
The piping system could be anything. Doesn't necessarily need to be water cooling system. Also, there's no contractor inspecting the man's work.
exists e1 p1 s1 x1 x2 x3 x4.(Topic(e1,p1) & Actor(e1,x1) & v_appear(e1) & exists e2 x5 x6.(on(e2,x5) & n_system(x5) & of(x5,x6) & n_piping(x6) & Actor(e2,x1) & v_work(e2)) & in(x1,x2) & subset_of(x4,x2) & n_jeans(x4) & subset_of(x3,x2) & n_shirt(x3) & a_black(s1) & Theme(s1,x3) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_system(x2) & of(x2,x4) & n_cooling(x4) & of(x2,x3) & n_water(x3) & n_contractor(x1) & Theme(e1,x2) & Actor(e1,x1) & v_inspect(e1))