Two firemen turning the water on in the hoses.
Two men are at work.
It is the job of the firemen to use water hoses to douse fire, so they are at work.
exists e1 s1 x1 x2 x3.(n_hose(x3) & n_water(x2) & in(e1,x3) & a_on(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_turn(e1) & n_fireman(x1) & card_eq_2(x1))
exists p1 x1.(exists x2.(at(x1,x2) & n_work(x2)) & n_man(x1) & card_eq_2(x1))