Machinists at work with heavy machinery.
Machinists are working.
work with heavy machinery implies they are working.
exists s1 x1 x2 x3.(a_topic(x1) & at(x1,x2) & with(x2,x3) & n_machinery(x3) & a_heavy(s1) & Theme(s1,x3) & n_work(x2) & n_machinist(x1))
exists e1 x1.(Actor(e1,x1) & v_work(e1) & n_machinist(x1))