A couple show their affection on an escalator by embracing and kissing one another.
The couple is kissing.
The couple kissing is a form of showing affection to each other
exists e2 e3 e1 s1 x1 x2 x3 x4.(by(e1,e3) & Theme(e3,x4) & Actor(e3,x1) & v_kiss(e3) & n_thing(x4) & card_eq_1(x4) & a_another(s1) & Theme(s1,x4) & by(e1,e2) & Actor(e2,x1) & v_embrace(e2) & on(e1,x3) & n_escalator(x3) & Theme(e1,x2) & Actor(e1,x1) & v_show(e1) & n_affection(x2) & of(x2,x1) & n_thing(x1) & n_couple(x1))
exists e1 x1.(n_couple(x1) & Actor(e1,x1) & v_kiss(e1))