People on ATVs and dirt bikes are traveling along a worn path in a field surrounded by trees.
People on recreational vehicles riding in a field.
ATVs and dirt bikes are examples of recreational vehicles, therefore the people on the recreational vehicles are on ATVs and dirt bikes.
exists e2 e1 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9.(ne_nam_atvs(x3) & along(e1,x6) & Actor(e2,x9) & n_tree(x9) & Theme(e2,x8) & v_surround(e2) & (x6 = x8) & in(x6,x7) & n_field(x7) & n_path(x6) & a_worn(s1) & Theme(s1,x6) & Actor(e1,x1) & v_travel(e1) & on(x1,x2) & subset_of(x4,x2) & n_bike(x4) & of(x4,x5) & n_dirt(x5) & subset_of(x3,x2) & n_people(x1))
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_field(x4) & Actor(e1,x3) & v_ride(e1) & (x1 = x3) & on(x1,x2) & n_vehicle(x2) & a_recreational(s1) & Theme(s1,x2) & n_people(x1))