Young people standing around smiling.
A group of teenagers are outside smiling.
Young people is subjective. Anyone younger than the age of the observer could be a young person, but doesn't mean they are teenagers.
exists e1 e2 s1 x1 x2.(a_topic(x1) & around(e1,e2) & Actor(e2,x2) & v_smile(e2) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(for(s1,e1) & Actor(e1,x1) & v_smile(e1) & Theme(s1,x1) & a_outside(s1) & of(x1,x2) & n_teenager(x2) & n_group(x1))