A husband and wife walk by a marketplace while traveling.
A man and woman walk through a marketplace in China.
One can walk by something without walking through it.  One can travel to places other than China.
exists e1 e2 x1 x2 x3 x4.(while(e1,e2) & Actor(e2,x1) & v_travel(e2) & Actor(e1,x4) & n_marketplace(x4) & Theme(e1,x1) & v_walk(e1) & subset_of(x3,x1) & n_wife(x3) & subset_of(x2,x1) & n_husband(x2))
exists s1 x1 x2 x3 x4 x5.(ne_geo_china(x5) & a_topic(s1) & subset_of(x2,s1) & through(x2,x4) & in(x4,x5) & n_marketplace(x4) & n_walk(x2) & of(x2,x3) & n_woman(x3) & subset_of(x1,s1) & n_man(x1))