a girl walks in the ocean.
A girl walks in the Atlantic ocean.
You don't typically walk in the ocean, and it doesn't have to be the atlantic.
exists e1 x1 x2.(n_ocean(x2) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_girl(x1))
exists e1 x1 x2 x3.(n_ocean(x2) & (x2 = x3) & ne_geo_atlantic(x3) & in(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_girl(x1))