A young child wearing a backpack follows behind an adult as they walk through the trees.
They are hiking.
the fact that the child is wearing a backpack following an adult and they walk through trees indicates that they are hiking, as that is what hiking is.
exists e1 e2 p1 s1 x1 x2 x3 x4 x5.(n_tree(x5) & exists e3.(through(e3,x5) & Actor(e3,x1) & v_walk(e3)) & n_thing(x1) & as(e2,p1) & behind(e2,x4) & n_adult(x4) & Actor(e2,x1) & v_follow(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_backpack(x3) & (x1 = x2) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1.(n_thing(x1) & Actor(e1,x1) & v_hike(e1))